From 8a002d855fc41965eb5516ff52cbcee9838140a5 Mon Sep 17 00:00:00 2001
From: Maciej Pytel <maciekpytel@google.com>
Date: Tue, 20 Feb 2018 20:03:39 +0100
Subject: [PATCH 1/3] Add external metric type to HPA API

---
 pkg/apis/autoscaling/types.go                 | 57 ++++++++++++++++++
 .../src/k8s.io/api/autoscaling/v1/types.go    | 57 ++++++++++++++++++
 .../k8s.io/api/autoscaling/v2beta1/types.go   | 58 +++++++++++++++++++
 3 files changed, 172 insertions(+)

diff --git a/pkg/apis/autoscaling/types.go b/pkg/apis/autoscaling/types.go
index 71837b87236..5489742db90 100644
--- a/pkg/apis/autoscaling/types.go
+++ b/pkg/apis/autoscaling/types.go
@@ -111,6 +111,12 @@ var (
 	// Kubernetes, and have special scaling options on top of those available
 	// to normal per-pod metrics (the "pods" source).
 	ResourceMetricSourceType MetricSourceType = "Resource"
+	// ExternalMetricSourceType is a global metric that is not associated
+	// with any Kubernetes object. It allows autoscaling based on information
+	// coming from components running outside of cluster
+	// (for example length of queue in cloud messaging service, or
+	// QPS from loadbalancer running outside of cluster).
+	ExternalMetricSourceType MetricSourceType = "External"
 )
 
 // MetricSpec specifies how to scale based on a single metric
@@ -136,6 +142,13 @@ type MetricSpec struct {
 	// to normal per-pod metrics using the "pods" source.
 	// +optional
 	Resource *ResourceMetricSource
+	// External refers to a global metric that is not associated
+	// with any Kubernetes object. It allows autoscaling based on information
+	// coming from components running outside of cluster
+	// (for example length of queue in cloud messaging service, or
+	// QPS from loadbalancer running outside of cluster).
+	// +optional
+	External *ExternalMetricSource
 }
 
 // ObjectMetricSource indicates how to scale on a metric describing a
@@ -184,6 +197,26 @@ type ResourceMetricSource struct {
 	TargetAverageValue *resource.Quantity
 }
 
+// ExternalMetricSource indicates how to scale on a metric not associated with
+// any Kubernetes object (for example length of queue in cloud
+// messaging service, or QPS from loadbalancer running outside of cluster).
+type ExternalMetricSource struct {
+	// metricName is the name of the metric in question.
+	MetricName string
+	// MetricSelector is used to identify a specific time series
+	// within a given metric.
+	// +optional
+	MetricSelector *metav1.LabelSelector
+	// TargetValue is the target value of the metric (as a quantity).
+	// Mutually exclusive with TargetAverageValue.
+	// +optional
+	TargetValue *resource.Quantity
+	// TargetAverageValue is the target per-pod value of global metric (as a quantity).
+	// Mutually exclusive with TargetValue.
+	// +optional
+	TargetAverageValue *resource.Quantity
+}
+
 // HorizontalPodAutoscalerStatus describes the current status of a horizontal pod autoscaler.
 type HorizontalPodAutoscalerStatus struct {
 	// ObservedGeneration is the most recent generation observed by this autoscaler.
@@ -282,6 +315,13 @@ type MetricStatus struct {
 	// to normal per-pod metrics using the "pods" source.
 	// +optional
 	Resource *ResourceMetricStatus
+	// External refers to a global metric that is not associated
+	// with any Kubernetes object. It allows autoscaling based on information
+	// coming from components running outside of cluster
+	// (for example length of queue in cloud messaging service, or
+	// QPS from loadbalancer running outside of cluster).
+	// +optional
+	External *ExternalMetricStatus
 }
 
 // ObjectMetricStatus indicates the current value of a metric describing a
@@ -328,6 +368,23 @@ type ResourceMetricStatus struct {
 	CurrentAverageValue resource.Quantity
 }
 
+// ExternalMetricStatus indicates the current value of a global metric
+// not associated with any Kubernetes object.
+type ExternalMetricStatus struct {
+	// MetricName is the name of a metric used for autoscaling in
+	// metric system.
+	MetricName string
+	// MetricSelector is used to identify a specific time series
+	// within a given metric.
+	// +optional
+	MetricSelector *metav1.LabelSelector
+	// CurrentValue is the current value of the metric (as a quantity)
+	CurrentValue resource.Quantity
+	// CurrentAverageValue is the current value of metric averaged over autoscaled pods.
+	// +optional
+	CurrentAverageValue *resource.Quantity
+}
+
 // +genclient
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
 
diff --git a/staging/src/k8s.io/api/autoscaling/v1/types.go b/staging/src/k8s.io/api/autoscaling/v1/types.go
index eeadaf88475..344af774f00 100644
--- a/staging/src/k8s.io/api/autoscaling/v1/types.go
+++ b/staging/src/k8s.io/api/autoscaling/v1/types.go
@@ -161,6 +161,12 @@ var (
 	// Kubernetes, and have special scaling options on top of those available
 	// to normal per-pod metrics (the "pods" source).
 	ResourceMetricSourceType MetricSourceType = "Resource"
+	// ExternalMetricSourceType is a global metric that is not associated
+	// with any Kubernetes object. It allows autoscaling based on information
+	// coming from components running outside of cluster
+	// (for example length of queue in cloud messaging service, or
+	// QPS from loadbalancer running outside of cluster).
+	ExternalMetricSourceType MetricSourceType = "External"
 )
 
 // MetricSpec specifies how to scale based on a single metric
@@ -186,6 +192,13 @@ type MetricSpec struct {
 	// to normal per-pod metrics using the "pods" source.
 	// +optional
 	Resource *ResourceMetricSource `json:"resource,omitempty" protobuf:"bytes,4,opt,name=resource"`
+	// external refers to a global metric that is not associated
+	// with any Kubernetes object. It allows autoscaling based on information
+	// coming from components running outside of cluster
+	// (for example length of queue in cloud messaging service, or
+	// QPS from loadbalancer running outside of cluster).
+	// +optional
+	External *ExternalMetricSource `json:"external,omitempty" protobuf:"bytes,5,opt,name=external"`
 }
 
 // ObjectMetricSource indicates how to scale on a metric describing a
@@ -234,6 +247,26 @@ type ResourceMetricSource struct {
 	TargetAverageValue *resource.Quantity `json:"targetAverageValue,omitempty" protobuf:"bytes,3,opt,name=targetAverageValue"`
 }
 
+// ExternalMetricSource indicates how to scale on a metric not associated with
+// any Kubernetes object (for example length of queue in cloud
+// messaging service, or QPS from loadbalancer running outside of cluster).
+type ExternalMetricSource struct {
+	// metricName is the name of the metric in question.
+	MetricName string `json:"metricName" protobuf:"bytes,1,name=metricName"`
+	// metricSelector is used to identify a specific time series
+	// within a given metric.
+	// +optional
+	MetricSelector *metav1.LabelSelector `json:"metricSelector,omitempty" protobuf:"bytes,2,opt,name=metricSelector"`
+	// targetValue is the target value of the metric (as a quantity).
+	// Mutually exclusive with TargetAverageValue.
+	// +optional
+	TargetValue *resource.Quantity `json:"targetValue,omitempty" protobuf:"bytes,3,opt,name=targetValue"`
+	// targetAverageValue is the target per-pod value of global metric (as a quantity).
+	// Mutually exclusive with TargetValue.
+	// +optional
+	TargetAverageValue *resource.Quantity `json:"targetAverageValue,omitempty" protobuf:"bytes,4,opt,name=targetAverageValue"`
+}
+
 // MetricStatus describes the last-read state of a single metric.
 type MetricStatus struct {
 	// type is the type of metric source.  It will be one of "Object",
@@ -256,6 +289,13 @@ type MetricStatus struct {
 	// to normal per-pod metrics using the "pods" source.
 	// +optional
 	Resource *ResourceMetricStatus `json:"resource,omitempty" protobuf:"bytes,4,opt,name=resource"`
+	// external refers to a global metric that is not associated
+	// with any Kubernetes object. It allows autoscaling based on information
+	// coming from components running outside of cluster
+	// (for example length of queue in cloud messaging service, or
+	// QPS from loadbalancer running outside of cluster).
+	// +optional
+	External *ExternalMetricStatus `json:"external,omitempty" protobuf:"bytes,5,opt,name=external"`
 }
 
 // HorizontalPodAutoscalerConditionType are the valid conditions of
@@ -337,3 +377,20 @@ type ResourceMetricStatus struct {
 	// It will always be set, regardless of the corresponding metric specification.
 	CurrentAverageValue resource.Quantity `json:"currentAverageValue" protobuf:"bytes,3,name=currentAverageValue"`
 }
+
+// ExternalMetricStatus indicates the current value of a global metric
+// not associated with any Kubernetes object.
+type ExternalMetricStatus struct {
+	// metricName is the name of a metric used for autoscaling in
+	// metric system.
+	MetricName string `json:"metricName" protobuf:"bytes,1,name=metricName"`
+	// metricSelector is used to identify a specific time series
+	// within a given metric.
+	// +optional
+	MetricSelector *metav1.LabelSelector `json:"metricSelector,omitempty" protobuf:"bytes,2,opt,name=metricSelector"`
+	// currentValue is the current value of the metric (as a quantity)
+	CurrentValue resource.Quantity `json:"currentValue" protobuf:"bytes,3,name=currentValue"`
+	// currentAverageValue is the current value of metric averaged over autoscaled pods.
+	// +optional
+	CurrentAverageValue *resource.Quantity `json:"currentAverageValue,omitempty" protobuf:"bytes,4,opt,name=currentAverageValue"`
+}
diff --git a/staging/src/k8s.io/api/autoscaling/v2beta1/types.go b/staging/src/k8s.io/api/autoscaling/v2beta1/types.go
index 22e53573b2f..f842cc342da 100644
--- a/staging/src/k8s.io/api/autoscaling/v2beta1/types.go
+++ b/staging/src/k8s.io/api/autoscaling/v2beta1/types.go
@@ -73,6 +73,12 @@ var (
 	// Kubernetes, and have special scaling options on top of those available
 	// to normal per-pod metrics (the "pods" source).
 	ResourceMetricSourceType MetricSourceType = "Resource"
+	// ExternalMetricSourceType is a global metric that is not associated
+	// with any Kubernetes object. It allows autoscaling based on information
+	// coming from components running outside of cluster
+	// (for example length of queue in cloud messaging service, or
+	// QPS from loadbalancer running outside of cluster).
+	ExternalMetricSourceType MetricSourceType = "External"
 )
 
 // MetricSpec specifies how to scale based on a single metric
@@ -98,6 +104,13 @@ type MetricSpec struct {
 	// to normal per-pod metrics using the "pods" source.
 	// +optional
 	Resource *ResourceMetricSource `json:"resource,omitempty" protobuf:"bytes,4,opt,name=resource"`
+	// external refers to a global metric that is not associated
+	// with any Kubernetes object. It allows autoscaling based on information
+	// coming from components running outside of cluster
+	// (for example length of queue in cloud messaging service, or
+	// QPS from loadbalancer running outside of cluster).
+	// +optional
+	External *ExternalMetricSource `json:"external,omitempty" protobuf:"bytes,5,opt,name=external"`
 }
 
 // ObjectMetricSource indicates how to scale on a metric describing a
@@ -146,6 +159,27 @@ type ResourceMetricSource struct {
 	TargetAverageValue *resource.Quantity `json:"targetAverageValue,omitempty" protobuf:"bytes,3,opt,name=targetAverageValue"`
 }
 
+// ExternalMetricSource indicates how to scale on a metric not associated with
+// any Kubernetes object (for example length of queue in cloud
+// messaging service, or QPS from loadbalancer running outside of cluster).
+// Exactly one "target" type should be set.
+type ExternalMetricSource struct {
+	// metricName is the name of the metric in question.
+	MetricName string `json:"metricName" protobuf:"bytes,1,name=metricName"`
+	// metricSelector is used to identify a specific time series
+	// within a given metric.
+	// +optional
+	MetricSelector *metav1.LabelSelector `json:"metricSelector,omitempty" protobuf:"bytes,2,opt,name=metricSelector"`
+	// targetValue is the target value of the metric (as a quantity).
+	// Mutually exclusive with TargetAverageValue.
+	// +optional
+	TargetValue *resource.Quantity `json:"targetValue,omitempty" protobuf:"bytes,3,opt,name=targetValue"`
+	// targetAverageValue is the target per-pod value of global metric (as a quantity).
+	// Mutually exclusive with TargetValue.
+	// +optional
+	TargetAverageValue *resource.Quantity `json:"targetAverageValue,omitempty" protobuf:"bytes,4,opt,name=targetAverageValue"`
+}
+
 // HorizontalPodAutoscalerStatus describes the current status of a horizontal pod autoscaler.
 type HorizontalPodAutoscalerStatus struct {
 	// observedGeneration is the most recent generation observed by this autoscaler.
@@ -231,6 +265,13 @@ type MetricStatus struct {
 	// to normal per-pod metrics using the "pods" source.
 	// +optional
 	Resource *ResourceMetricStatus `json:"resource,omitempty" protobuf:"bytes,4,opt,name=resource"`
+	// external refers to a global metric that is not associated
+	// with any Kubernetes object. It allows autoscaling based on information
+	// coming from components running outside of cluster
+	// (for example length of queue in cloud messaging service, or
+	// QPS from loadbalancer running outside of cluster).
+	// +optional
+	External *ExternalMetricStatus `json:"external,omitempty" protobuf:"bytes,5,opt,name=external"`
 }
 
 // ObjectMetricStatus indicates the current value of a metric describing a
@@ -277,6 +318,23 @@ type ResourceMetricStatus struct {
 	CurrentAverageValue resource.Quantity `json:"currentAverageValue" protobuf:"bytes,3,name=currentAverageValue"`
 }
 
+// ExternalMetricStatus indicates the current value of a global metric
+// not associated with any Kubernetes object.
+type ExternalMetricStatus struct {
+	// metricName is the name of a metric used for autoscaling in
+	// metric system.
+	MetricName string `json:"metricName" protobuf:"bytes,1,name=metricName"`
+	// metricSelector is used to identify a specific time series
+	// within a given metric.
+	// +optional
+	MetricSelector *metav1.LabelSelector `json:"metricSelector,omitempty" protobuf:"bytes,2,opt,name=metricSelector"`
+	// currentValue is the current value of the metric (as a quantity)
+	CurrentValue resource.Quantity `json:"currentValue" protobuf:"bytes,3,name=currentValue"`
+	// currentAverageValue is the current value of metric averaged over autoscaled pods.
+	// +optional
+	CurrentAverageValue *resource.Quantity `json:"currentAverageValue,omitempty" protobuf:"bytes,4,opt,name=currentAverageValue"`
+}
+
 // +genclient
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
 

From 079f3f1829eca6234a3286716021ca5aacfc1897 Mon Sep 17 00:00:00 2001
From: Maciej Pytel <maciekpytel@google.com>
Date: Tue, 20 Feb 2018 20:48:59 +0100
Subject: [PATCH 2/3] Autogenerated code for HPA external metrics

---
 api/openapi-spec/swagger.json                 |  57 ++
 api/swagger-spec/autoscaling_v2beta1.json     | 101 ++
 .../autoscaling/v2beta1/definitions.html      | 213 ++++
 .../autoscaling/v1/zz_generated.conversion.go |  60 ++
 .../v2beta1/zz_generated.conversion.go        |  74 +-
 pkg/apis/autoscaling/zz_generated.deepcopy.go |  96 ++
 .../k8s.io/api/autoscaling/v1/generated.pb.go | 936 +++++++++++++++---
 .../k8s.io/api/autoscaling/v1/generated.proto |  59 ++
 .../v1/types_swagger_doc_generated.go         |  26 +
 .../autoscaling/v1/zz_generated.deepcopy.go   |  96 ++
 .../api/autoscaling/v2beta1/generated.pb.go   | 913 ++++++++++++++---
 .../api/autoscaling/v2beta1/generated.proto   |  60 ++
 .../v2beta1/types_swagger_doc_generated.go    |  26 +
 .../v2beta1/zz_generated.deepcopy.go          |  96 ++
 14 files changed, 2516 insertions(+), 297 deletions(-)

diff --git a/api/openapi-spec/swagger.json b/api/openapi-spec/swagger.json
index 0754abf13f6..e8987e91b20 100644
--- a/api/openapi-spec/swagger.json
+++ b/api/openapi-spec/swagger.json
@@ -74931,6 +74931,55 @@
      }
     }
    },
+   "io.k8s.api.autoscaling.v2beta1.ExternalMetricSource": {
+    "description": "ExternalMetricSource indicates how to scale on a metric not associated with any Kubernetes object (for example length of queue in cloud messaging service, or QPS from loadbalancer running outside of cluster). Exactly one \"target\" type should be set.",
+    "required": [
+     "metricName"
+    ],
+    "properties": {
+     "metricName": {
+      "description": "metricName is the name of the metric in question.",
+      "type": "string"
+     },
+     "metricSelector": {
+      "description": "metricSelector is used to identify a specific time series within a given metric.",
+      "$ref": "#/definitions/io.k8s.apimachinery.pkg.apis.meta.v1.LabelSelector"
+     },
+     "targetAverageValue": {
+      "description": "targetAverageValue is the target per-pod value of global metric (as a quantity). Mutually exclusive with TargetValue.",
+      "$ref": "#/definitions/io.k8s.apimachinery.pkg.api.resource.Quantity"
+     },
+     "targetValue": {
+      "description": "targetValue is the target value of the metric (as a quantity). Mutually exclusive with TargetAverageValue.",
+      "$ref": "#/definitions/io.k8s.apimachinery.pkg.api.resource.Quantity"
+     }
+    }
+   },
+   "io.k8s.api.autoscaling.v2beta1.ExternalMetricStatus": {
+    "description": "ExternalMetricStatus indicates the current value of a global metric not associated with any Kubernetes object.",
+    "required": [
+     "metricName",
+     "currentValue"
+    ],
+    "properties": {
+     "currentAverageValue": {
+      "description": "currentAverageValue is the current value of metric averaged over autoscaled pods.",
+      "$ref": "#/definitions/io.k8s.apimachinery.pkg.api.resource.Quantity"
+     },
+     "currentValue": {
+      "description": "currentValue is the current value of the metric (as a quantity)",
+      "$ref": "#/definitions/io.k8s.apimachinery.pkg.api.resource.Quantity"
+     },
+     "metricName": {
+      "description": "metricName is the name of a metric used for autoscaling in metric system.",
+      "type": "string"
+     },
+     "metricSelector": {
+      "description": "metricSelector is used to identify a specific time series within a given metric.",
+      "$ref": "#/definitions/io.k8s.apimachinery.pkg.apis.meta.v1.LabelSelector"
+     }
+    }
+   },
    "io.k8s.api.autoscaling.v2beta1.HorizontalPodAutoscaler": {
     "description": "HorizontalPodAutoscaler is the configuration for a horizontal pod autoscaler, which automatically manages the replica count of any resource implementing the scale subresource based on the metrics specified.",
     "properties": {
@@ -75106,6 +75155,10 @@
      "type"
     ],
     "properties": {
+     "external": {
+      "description": "external refers to a global metric that is not associated with any Kubernetes object. It allows autoscaling based on information coming from components running outside of cluster (for example length of queue in cloud messaging service, or QPS from loadbalancer running outside of cluster).",
+      "$ref": "#/definitions/io.k8s.api.autoscaling.v2beta1.ExternalMetricSource"
+     },
      "object": {
       "description": "object refers to a metric describing a single kubernetes object (for example, hits-per-second on an Ingress object).",
       "$ref": "#/definitions/io.k8s.api.autoscaling.v2beta1.ObjectMetricSource"
@@ -75130,6 +75183,10 @@
      "type"
     ],
     "properties": {
+     "external": {
+      "description": "external refers to a global metric that is not associated with any Kubernetes object. It allows autoscaling based on information coming from components running outside of cluster (for example length of queue in cloud messaging service, or QPS from loadbalancer running outside of cluster).",
+      "$ref": "#/definitions/io.k8s.api.autoscaling.v2beta1.ExternalMetricStatus"
+     },
      "object": {
       "description": "object refers to a metric describing a single kubernetes object (for example, hits-per-second on an Ingress object).",
       "$ref": "#/definitions/io.k8s.api.autoscaling.v2beta1.ObjectMetricStatus"
diff --git a/api/swagger-spec/autoscaling_v2beta1.json b/api/swagger-spec/autoscaling_v2beta1.json
index 82db93fdc7b..b8a909ef9d5 100644
--- a/api/swagger-spec/autoscaling_v2beta1.json
+++ b/api/swagger-spec/autoscaling_v2beta1.json
@@ -1560,6 +1560,10 @@
      "resource": {
       "$ref": "v2beta1.ResourceMetricSource",
       "description": "resource refers to a resource metric (such as those specified in requests and limits) known to Kubernetes describing each pod in the current scale target (e.g. CPU or memory). Such metrics are built in to Kubernetes, and have special scaling options on top of those available to normal per-pod metrics using the \"pods\" source."
+     },
+     "external": {
+      "$ref": "v2beta1.ExternalMetricSource",
+      "description": "external refers to a global metric that is not associated with any Kubernetes object. It allows autoscaling based on information coming from components running outside of cluster (for example length of queue in cloud messaging service, or QPS from loadbalancer running outside of cluster)."
      }
     }
    },
@@ -1626,6 +1630,73 @@
      }
     }
    },
+   "v2beta1.ExternalMetricSource": {
+    "id": "v2beta1.ExternalMetricSource",
+    "description": "ExternalMetricSource indicates how to scale on a metric not associated with any Kubernetes object (for example length of queue in cloud messaging service, or QPS from loadbalancer running outside of cluster). Exactly one \"target\" type should be set.",
+    "required": [
+     "metricName"
+    ],
+    "properties": {
+     "metricName": {
+      "type": "string",
+      "description": "metricName is the name of the metric in question."
+     },
+     "metricSelector": {
+      "$ref": "v1.LabelSelector",
+      "description": "metricSelector is used to identify a specific time series within a given metric."
+     },
+     "targetValue": {
+      "type": "string",
+      "description": "targetValue is the target value of the metric (as a quantity). Mutually exclusive with TargetAverageValue."
+     },
+     "targetAverageValue": {
+      "type": "string",
+      "description": "targetAverageValue is the target per-pod value of global metric (as a quantity). Mutually exclusive with TargetValue."
+     }
+    }
+   },
+   "v1.LabelSelector": {
+    "id": "v1.LabelSelector",
+    "description": "A label selector is a label query over a set of resources. The result of matchLabels and matchExpressions are ANDed. An empty label selector matches all objects. A null label selector matches no objects.",
+    "properties": {
+     "matchLabels": {
+      "type": "object",
+      "description": "matchLabels is a map of {key,value} pairs. A single {key,value} in the matchLabels map is equivalent to an element of matchExpressions, whose key field is \"key\", the operator is \"In\", and the values array contains only \"value\". The requirements are ANDed."
+     },
+     "matchExpressions": {
+      "type": "array",
+      "items": {
+       "$ref": "v1.LabelSelectorRequirement"
+      },
+      "description": "matchExpressions is a list of label selector requirements. The requirements are ANDed."
+     }
+    }
+   },
+   "v1.LabelSelectorRequirement": {
+    "id": "v1.LabelSelectorRequirement",
+    "description": "A label selector requirement is a selector that contains values, a key, and an operator that relates the key and values.",
+    "required": [
+     "key",
+     "operator"
+    ],
+    "properties": {
+     "key": {
+      "type": "string",
+      "description": "key is the label key that the selector applies to."
+     },
+     "operator": {
+      "type": "string",
+      "description": "operator represents a key's relationship to a set of values. Valid operators are In, NotIn, Exists and DoesNotExist."
+     },
+     "values": {
+      "type": "array",
+      "items": {
+       "type": "string"
+      },
+      "description": "values is an array of string values. If the operator is In or NotIn, the values array must be non-empty. If the operator is Exists or DoesNotExist, the values array must be empty. This array is replaced during a strategic merge patch."
+     }
+    }
+   },
    "v2beta1.HorizontalPodAutoscalerStatus": {
     "id": "v2beta1.HorizontalPodAutoscalerStatus",
     "description": "HorizontalPodAutoscalerStatus describes the current status of a horizontal pod autoscaler.",
@@ -1693,6 +1764,10 @@
      "resource": {
       "$ref": "v2beta1.ResourceMetricStatus",
       "description": "resource refers to a resource metric (such as those specified in requests and limits) known to Kubernetes describing each pod in the current scale target (e.g. CPU or memory). Such metrics are built in to Kubernetes, and have special scaling options on top of those available to normal per-pod metrics using the \"pods\" source."
+     },
+     "external": {
+      "$ref": "v2beta1.ExternalMetricStatus",
+      "description": "external refers to a global metric that is not associated with any Kubernetes object. It allows autoscaling based on information coming from components running outside of cluster (for example length of queue in cloud messaging service, or QPS from loadbalancer running outside of cluster)."
      }
     }
    },
@@ -1760,6 +1835,32 @@
      }
     }
    },
+   "v2beta1.ExternalMetricStatus": {
+    "id": "v2beta1.ExternalMetricStatus",
+    "description": "ExternalMetricStatus indicates the current value of a global metric not associated with any Kubernetes object.",
+    "required": [
+     "metricName",
+     "currentValue"
+    ],
+    "properties": {
+     "metricName": {
+      "type": "string",
+      "description": "metricName is the name of a metric used for autoscaling in metric system."
+     },
+     "metricSelector": {
+      "$ref": "v1.LabelSelector",
+      "description": "metricSelector is used to identify a specific time series within a given metric."
+     },
+     "currentValue": {
+      "type": "string",
+      "description": "currentValue is the current value of the metric (as a quantity)"
+     },
+     "currentAverageValue": {
+      "type": "string",
+      "description": "currentAverageValue is the current value of metric averaged over autoscaled pods."
+     }
+    }
+   },
    "v2beta1.HorizontalPodAutoscalerCondition": {
     "id": "v2beta1.HorizontalPodAutoscalerCondition",
     "description": "HorizontalPodAutoscalerCondition describes the state of a HorizontalPodAutoscaler at a certain point.",
diff --git a/docs/api-reference/autoscaling/v2beta1/definitions.html b/docs/api-reference/autoscaling/v2beta1/definitions.html
index f8be7d0c377..df8f82d269f 100755
--- a/docs/api-reference/autoscaling/v2beta1/definitions.html
+++ b/docs/api-reference/autoscaling/v2beta1/definitions.html
@@ -845,6 +845,47 @@ span.icon > [class^="icon-"], span.icon > [class*=" icon-"] { cursor: default; }
 </tbody>
 </table>
 
+</div>
+<div class="sect2">
+<h3 id="_v1_labelselector">v1.LabelSelector</h3>
+<div class="paragraph">
+<p>A label selector is a label query over a set of resources. The result of matchLabels and matchExpressions are ANDed. An empty label selector matches all objects. A null label selector matches no objects.</p>
+</div>
+<table class="tableblock frame-all grid-all" style="width:100%; ">
+<colgroup>
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;"> 
+</colgroup>
+<thead>
+<tr>
+<th class="tableblock halign-left valign-top">Name</th>
+<th class="tableblock halign-left valign-top">Description</th>
+<th class="tableblock halign-left valign-top">Required</th>
+<th class="tableblock halign-left valign-top">Schema</th>
+<th class="tableblock halign-left valign-top">Default</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">matchLabels</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">matchLabels is a map of {key,value} pairs. A single {key,value} in the matchLabels map is equivalent to an element of matchExpressions, whose key field is "key", the operator is "In", and the values array contains only "value". The requirements are ANDed.</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">object</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">matchExpressions</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">matchExpressions is a list of label selector requirements. The requirements are ANDed.</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="#_v1_labelselectorrequirement">v1.LabelSelectorRequirement</a> array</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+</tbody>
+</table>
+
 </div>
 <div class="sect2">
 <h3 id="_v2beta1_metricstatus">v2beta1.MetricStatus</h3>
@@ -897,6 +938,61 @@ span.icon > [class^="icon-"], span.icon > [class*=" icon-"] { cursor: default; }
 <td class="tableblock halign-left valign-top"><p class="tableblock"><a href="#_v2beta1_resourcemetricstatus">v2beta1.ResourceMetricStatus</a></p></td>
 <td class="tableblock halign-left valign-top"></td>
 </tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">external</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">external refers to a global metric that is not associated with any Kubernetes object. It allows autoscaling based on information coming from components running outside of cluster (for example length of queue in cloud messaging service, or QPS from loadbalancer running outside of cluster).</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="#_v2beta1_externalmetricstatus">v2beta1.ExternalMetricStatus</a></p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+</tbody>
+</table>
+
+</div>
+<div class="sect2">
+<h3 id="_v1_labelselectorrequirement">v1.LabelSelectorRequirement</h3>
+<div class="paragraph">
+<p>A label selector requirement is a selector that contains values, a key, and an operator that relates the key and values.</p>
+</div>
+<table class="tableblock frame-all grid-all" style="width:100%; ">
+<colgroup>
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;"> 
+</colgroup>
+<thead>
+<tr>
+<th class="tableblock halign-left valign-top">Name</th>
+<th class="tableblock halign-left valign-top">Description</th>
+<th class="tableblock halign-left valign-top">Required</th>
+<th class="tableblock halign-left valign-top">Schema</th>
+<th class="tableblock halign-left valign-top">Default</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">key</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">key is the label key that the selector applies to.</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">true</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">operator</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">operator represents a key&#8217;s relationship to a set of values. Valid operators are In, NotIn, Exists and DoesNotExist.</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">true</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">values</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">values is an array of string values. If the operator is In or NotIn, the values array must be non-empty. If the operator is Exists or DoesNotExist, the values array must be empty. This array is replaced during a strategic merge patch.</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">string array</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
 </tbody>
 </table>
 
@@ -996,10 +1092,120 @@ span.icon > [class^="icon-"], span.icon > [class*=" icon-"] { cursor: default; }
 </tbody>
 </table>
 
+</div>
+<div class="sect2">
+<h3 id="_v2beta1_externalmetricsource">v2beta1.ExternalMetricSource</h3>
+<div class="paragraph">
+<p>ExternalMetricSource indicates how to scale on a metric not associated with any Kubernetes object (for example length of queue in cloud messaging service, or QPS from loadbalancer running outside of cluster). Exactly one "target" type should be set.</p>
+</div>
+<table class="tableblock frame-all grid-all" style="width:100%; ">
+<colgroup>
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;"> 
+</colgroup>
+<thead>
+<tr>
+<th class="tableblock halign-left valign-top">Name</th>
+<th class="tableblock halign-left valign-top">Description</th>
+<th class="tableblock halign-left valign-top">Required</th>
+<th class="tableblock halign-left valign-top">Schema</th>
+<th class="tableblock halign-left valign-top">Default</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">metricName</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">metricName is the name of the metric in question.</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">true</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">metricSelector</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">metricSelector is used to identify a specific time series within a given metric.</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="#_v1_labelselector">v1.LabelSelector</a></p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">targetValue</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">targetValue is the target value of the metric (as a quantity). Mutually exclusive with TargetAverageValue.</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">targetAverageValue</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">targetAverageValue is the target per-pod value of global metric (as a quantity). Mutually exclusive with TargetValue.</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+</tbody>
+</table>
+
 </div>
 <div class="sect2">
 <h3 id="_v1_deletionpropagation">v1.DeletionPropagation</h3>
 
+</div>
+<div class="sect2">
+<h3 id="_v2beta1_externalmetricstatus">v2beta1.ExternalMetricStatus</h3>
+<div class="paragraph">
+<p>ExternalMetricStatus indicates the current value of a global metric not associated with any Kubernetes object.</p>
+</div>
+<table class="tableblock frame-all grid-all" style="width:100%; ">
+<colgroup>
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;"> 
+</colgroup>
+<thead>
+<tr>
+<th class="tableblock halign-left valign-top">Name</th>
+<th class="tableblock halign-left valign-top">Description</th>
+<th class="tableblock halign-left valign-top">Required</th>
+<th class="tableblock halign-left valign-top">Schema</th>
+<th class="tableblock halign-left valign-top">Default</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">metricName</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">metricName is the name of a metric used for autoscaling in metric system.</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">true</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">metricSelector</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">metricSelector is used to identify a specific time series within a given metric.</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="#_v1_labelselector">v1.LabelSelector</a></p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">currentValue</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">currentValue is the current value of the metric (as a quantity)</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">true</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">currentAverageValue</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">currentAverageValue is the current value of metric averaged over autoscaled pods.</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+</tbody>
+</table>
+
 </div>
 <div class="sect2">
 <h3 id="_v2beta1_horizontalpodautoscaler">v2beta1.HorizontalPodAutoscaler</h3>
@@ -1854,6 +2060,13 @@ Examples:<br>
 <td class="tableblock halign-left valign-top"><p class="tableblock"><a href="#_v2beta1_resourcemetricsource">v2beta1.ResourceMetricSource</a></p></td>
 <td class="tableblock halign-left valign-top"></td>
 </tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">external</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">external refers to a global metric that is not associated with any Kubernetes object. It allows autoscaling based on information coming from components running outside of cluster (for example length of queue in cloud messaging service, or QPS from loadbalancer running outside of cluster).</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="#_v2beta1_externalmetricsource">v2beta1.ExternalMetricSource</a></p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
 </tbody>
 </table>
 
diff --git a/pkg/apis/autoscaling/v1/zz_generated.conversion.go b/pkg/apis/autoscaling/v1/zz_generated.conversion.go
index 71fac630477..be5571aaf06 100644
--- a/pkg/apis/autoscaling/v1/zz_generated.conversion.go
+++ b/pkg/apis/autoscaling/v1/zz_generated.conversion.go
@@ -43,6 +43,10 @@ func RegisterConversions(scheme *runtime.Scheme) error {
 	return scheme.AddGeneratedConversionFuncs(
 		Convert_v1_CrossVersionObjectReference_To_autoscaling_CrossVersionObjectReference,
 		Convert_autoscaling_CrossVersionObjectReference_To_v1_CrossVersionObjectReference,
+		Convert_v1_ExternalMetricSource_To_autoscaling_ExternalMetricSource,
+		Convert_autoscaling_ExternalMetricSource_To_v1_ExternalMetricSource,
+		Convert_v1_ExternalMetricStatus_To_autoscaling_ExternalMetricStatus,
+		Convert_autoscaling_ExternalMetricStatus_To_v1_ExternalMetricStatus,
 		Convert_v1_HorizontalPodAutoscaler_To_autoscaling_HorizontalPodAutoscaler,
 		Convert_autoscaling_HorizontalPodAutoscaler_To_v1_HorizontalPodAutoscaler,
 		Convert_v1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition,
@@ -102,6 +106,58 @@ func Convert_autoscaling_CrossVersionObjectReference_To_v1_CrossVersionObjectRef
 	return autoConvert_autoscaling_CrossVersionObjectReference_To_v1_CrossVersionObjectReference(in, out, s)
 }
 
+func autoConvert_v1_ExternalMetricSource_To_autoscaling_ExternalMetricSource(in *v1.ExternalMetricSource, out *autoscaling.ExternalMetricSource, s conversion.Scope) error {
+	out.MetricName = in.MetricName
+	out.MetricSelector = (*meta_v1.LabelSelector)(unsafe.Pointer(in.MetricSelector))
+	out.TargetValue = (*resource.Quantity)(unsafe.Pointer(in.TargetValue))
+	out.TargetAverageValue = (*resource.Quantity)(unsafe.Pointer(in.TargetAverageValue))
+	return nil
+}
+
+// Convert_v1_ExternalMetricSource_To_autoscaling_ExternalMetricSource is an autogenerated conversion function.
+func Convert_v1_ExternalMetricSource_To_autoscaling_ExternalMetricSource(in *v1.ExternalMetricSource, out *autoscaling.ExternalMetricSource, s conversion.Scope) error {
+	return autoConvert_v1_ExternalMetricSource_To_autoscaling_ExternalMetricSource(in, out, s)
+}
+
+func autoConvert_autoscaling_ExternalMetricSource_To_v1_ExternalMetricSource(in *autoscaling.ExternalMetricSource, out *v1.ExternalMetricSource, s conversion.Scope) error {
+	out.MetricName = in.MetricName
+	out.MetricSelector = (*meta_v1.LabelSelector)(unsafe.Pointer(in.MetricSelector))
+	out.TargetValue = (*resource.Quantity)(unsafe.Pointer(in.TargetValue))
+	out.TargetAverageValue = (*resource.Quantity)(unsafe.Pointer(in.TargetAverageValue))
+	return nil
+}
+
+// Convert_autoscaling_ExternalMetricSource_To_v1_ExternalMetricSource is an autogenerated conversion function.
+func Convert_autoscaling_ExternalMetricSource_To_v1_ExternalMetricSource(in *autoscaling.ExternalMetricSource, out *v1.ExternalMetricSource, s conversion.Scope) error {
+	return autoConvert_autoscaling_ExternalMetricSource_To_v1_ExternalMetricSource(in, out, s)
+}
+
+func autoConvert_v1_ExternalMetricStatus_To_autoscaling_ExternalMetricStatus(in *v1.ExternalMetricStatus, out *autoscaling.ExternalMetricStatus, s conversion.Scope) error {
+	out.MetricName = in.MetricName
+	out.MetricSelector = (*meta_v1.LabelSelector)(unsafe.Pointer(in.MetricSelector))
+	out.CurrentValue = in.CurrentValue
+	out.CurrentAverageValue = (*resource.Quantity)(unsafe.Pointer(in.CurrentAverageValue))
+	return nil
+}
+
+// Convert_v1_ExternalMetricStatus_To_autoscaling_ExternalMetricStatus is an autogenerated conversion function.
+func Convert_v1_ExternalMetricStatus_To_autoscaling_ExternalMetricStatus(in *v1.ExternalMetricStatus, out *autoscaling.ExternalMetricStatus, s conversion.Scope) error {
+	return autoConvert_v1_ExternalMetricStatus_To_autoscaling_ExternalMetricStatus(in, out, s)
+}
+
+func autoConvert_autoscaling_ExternalMetricStatus_To_v1_ExternalMetricStatus(in *autoscaling.ExternalMetricStatus, out *v1.ExternalMetricStatus, s conversion.Scope) error {
+	out.MetricName = in.MetricName
+	out.MetricSelector = (*meta_v1.LabelSelector)(unsafe.Pointer(in.MetricSelector))
+	out.CurrentValue = in.CurrentValue
+	out.CurrentAverageValue = (*resource.Quantity)(unsafe.Pointer(in.CurrentAverageValue))
+	return nil
+}
+
+// Convert_autoscaling_ExternalMetricStatus_To_v1_ExternalMetricStatus is an autogenerated conversion function.
+func Convert_autoscaling_ExternalMetricStatus_To_v1_ExternalMetricStatus(in *autoscaling.ExternalMetricStatus, out *v1.ExternalMetricStatus, s conversion.Scope) error {
+	return autoConvert_autoscaling_ExternalMetricStatus_To_v1_ExternalMetricStatus(in, out, s)
+}
+
 func autoConvert_v1_HorizontalPodAutoscaler_To_autoscaling_HorizontalPodAutoscaler(in *v1.HorizontalPodAutoscaler, out *autoscaling.HorizontalPodAutoscaler, s conversion.Scope) error {
 	out.ObjectMeta = in.ObjectMeta
 	if err := Convert_v1_HorizontalPodAutoscalerSpec_To_autoscaling_HorizontalPodAutoscalerSpec(&in.Spec, &out.Spec, s); err != nil {
@@ -238,6 +294,7 @@ func autoConvert_v1_MetricSpec_To_autoscaling_MetricSpec(in *v1.MetricSpec, out
 	out.Object = (*autoscaling.ObjectMetricSource)(unsafe.Pointer(in.Object))
 	out.Pods = (*autoscaling.PodsMetricSource)(unsafe.Pointer(in.Pods))
 	out.Resource = (*autoscaling.ResourceMetricSource)(unsafe.Pointer(in.Resource))
+	out.External = (*autoscaling.ExternalMetricSource)(unsafe.Pointer(in.External))
 	return nil
 }
 
@@ -251,6 +308,7 @@ func autoConvert_autoscaling_MetricSpec_To_v1_MetricSpec(in *autoscaling.MetricS
 	out.Object = (*v1.ObjectMetricSource)(unsafe.Pointer(in.Object))
 	out.Pods = (*v1.PodsMetricSource)(unsafe.Pointer(in.Pods))
 	out.Resource = (*v1.ResourceMetricSource)(unsafe.Pointer(in.Resource))
+	out.External = (*v1.ExternalMetricSource)(unsafe.Pointer(in.External))
 	return nil
 }
 
@@ -264,6 +322,7 @@ func autoConvert_v1_MetricStatus_To_autoscaling_MetricStatus(in *v1.MetricStatus
 	out.Object = (*autoscaling.ObjectMetricStatus)(unsafe.Pointer(in.Object))
 	out.Pods = (*autoscaling.PodsMetricStatus)(unsafe.Pointer(in.Pods))
 	out.Resource = (*autoscaling.ResourceMetricStatus)(unsafe.Pointer(in.Resource))
+	out.External = (*autoscaling.ExternalMetricStatus)(unsafe.Pointer(in.External))
 	return nil
 }
 
@@ -277,6 +336,7 @@ func autoConvert_autoscaling_MetricStatus_To_v1_MetricStatus(in *autoscaling.Met
 	out.Object = (*v1.ObjectMetricStatus)(unsafe.Pointer(in.Object))
 	out.Pods = (*v1.PodsMetricStatus)(unsafe.Pointer(in.Pods))
 	out.Resource = (*v1.ResourceMetricStatus)(unsafe.Pointer(in.Resource))
+	out.External = (*v1.ExternalMetricStatus)(unsafe.Pointer(in.External))
 	return nil
 }
 
diff --git a/pkg/apis/autoscaling/v2beta1/zz_generated.conversion.go b/pkg/apis/autoscaling/v2beta1/zz_generated.conversion.go
index 2de9ae9b433..1942a2680f2 100644
--- a/pkg/apis/autoscaling/v2beta1/zz_generated.conversion.go
+++ b/pkg/apis/autoscaling/v2beta1/zz_generated.conversion.go
@@ -24,9 +24,9 @@ import (
 	unsafe "unsafe"
 
 	v2beta1 "k8s.io/api/autoscaling/v2beta1"
-	v1 "k8s.io/api/core/v1"
+	core_v1 "k8s.io/api/core/v1"
 	resource "k8s.io/apimachinery/pkg/api/resource"
-	meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	conversion "k8s.io/apimachinery/pkg/conversion"
 	runtime "k8s.io/apimachinery/pkg/runtime"
 	autoscaling "k8s.io/kubernetes/pkg/apis/autoscaling"
@@ -43,6 +43,10 @@ func RegisterConversions(scheme *runtime.Scheme) error {
 	return scheme.AddGeneratedConversionFuncs(
 		Convert_v2beta1_CrossVersionObjectReference_To_autoscaling_CrossVersionObjectReference,
 		Convert_autoscaling_CrossVersionObjectReference_To_v2beta1_CrossVersionObjectReference,
+		Convert_v2beta1_ExternalMetricSource_To_autoscaling_ExternalMetricSource,
+		Convert_autoscaling_ExternalMetricSource_To_v2beta1_ExternalMetricSource,
+		Convert_v2beta1_ExternalMetricStatus_To_autoscaling_ExternalMetricStatus,
+		Convert_autoscaling_ExternalMetricStatus_To_v2beta1_ExternalMetricStatus,
 		Convert_v2beta1_HorizontalPodAutoscaler_To_autoscaling_HorizontalPodAutoscaler,
 		Convert_autoscaling_HorizontalPodAutoscaler_To_v2beta1_HorizontalPodAutoscaler,
 		Convert_v2beta1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition,
@@ -96,6 +100,58 @@ func Convert_autoscaling_CrossVersionObjectReference_To_v2beta1_CrossVersionObje
 	return autoConvert_autoscaling_CrossVersionObjectReference_To_v2beta1_CrossVersionObjectReference(in, out, s)
 }
 
+func autoConvert_v2beta1_ExternalMetricSource_To_autoscaling_ExternalMetricSource(in *v2beta1.ExternalMetricSource, out *autoscaling.ExternalMetricSource, s conversion.Scope) error {
+	out.MetricName = in.MetricName
+	out.MetricSelector = (*v1.LabelSelector)(unsafe.Pointer(in.MetricSelector))
+	out.TargetValue = (*resource.Quantity)(unsafe.Pointer(in.TargetValue))
+	out.TargetAverageValue = (*resource.Quantity)(unsafe.Pointer(in.TargetAverageValue))
+	return nil
+}
+
+// Convert_v2beta1_ExternalMetricSource_To_autoscaling_ExternalMetricSource is an autogenerated conversion function.
+func Convert_v2beta1_ExternalMetricSource_To_autoscaling_ExternalMetricSource(in *v2beta1.ExternalMetricSource, out *autoscaling.ExternalMetricSource, s conversion.Scope) error {
+	return autoConvert_v2beta1_ExternalMetricSource_To_autoscaling_ExternalMetricSource(in, out, s)
+}
+
+func autoConvert_autoscaling_ExternalMetricSource_To_v2beta1_ExternalMetricSource(in *autoscaling.ExternalMetricSource, out *v2beta1.ExternalMetricSource, s conversion.Scope) error {
+	out.MetricName = in.MetricName
+	out.MetricSelector = (*v1.LabelSelector)(unsafe.Pointer(in.MetricSelector))
+	out.TargetValue = (*resource.Quantity)(unsafe.Pointer(in.TargetValue))
+	out.TargetAverageValue = (*resource.Quantity)(unsafe.Pointer(in.TargetAverageValue))
+	return nil
+}
+
+// Convert_autoscaling_ExternalMetricSource_To_v2beta1_ExternalMetricSource is an autogenerated conversion function.
+func Convert_autoscaling_ExternalMetricSource_To_v2beta1_ExternalMetricSource(in *autoscaling.ExternalMetricSource, out *v2beta1.ExternalMetricSource, s conversion.Scope) error {
+	return autoConvert_autoscaling_ExternalMetricSource_To_v2beta1_ExternalMetricSource(in, out, s)
+}
+
+func autoConvert_v2beta1_ExternalMetricStatus_To_autoscaling_ExternalMetricStatus(in *v2beta1.ExternalMetricStatus, out *autoscaling.ExternalMetricStatus, s conversion.Scope) error {
+	out.MetricName = in.MetricName
+	out.MetricSelector = (*v1.LabelSelector)(unsafe.Pointer(in.MetricSelector))
+	out.CurrentValue = in.CurrentValue
+	out.CurrentAverageValue = (*resource.Quantity)(unsafe.Pointer(in.CurrentAverageValue))
+	return nil
+}
+
+// Convert_v2beta1_ExternalMetricStatus_To_autoscaling_ExternalMetricStatus is an autogenerated conversion function.
+func Convert_v2beta1_ExternalMetricStatus_To_autoscaling_ExternalMetricStatus(in *v2beta1.ExternalMetricStatus, out *autoscaling.ExternalMetricStatus, s conversion.Scope) error {
+	return autoConvert_v2beta1_ExternalMetricStatus_To_autoscaling_ExternalMetricStatus(in, out, s)
+}
+
+func autoConvert_autoscaling_ExternalMetricStatus_To_v2beta1_ExternalMetricStatus(in *autoscaling.ExternalMetricStatus, out *v2beta1.ExternalMetricStatus, s conversion.Scope) error {
+	out.MetricName = in.MetricName
+	out.MetricSelector = (*v1.LabelSelector)(unsafe.Pointer(in.MetricSelector))
+	out.CurrentValue = in.CurrentValue
+	out.CurrentAverageValue = (*resource.Quantity)(unsafe.Pointer(in.CurrentAverageValue))
+	return nil
+}
+
+// Convert_autoscaling_ExternalMetricStatus_To_v2beta1_ExternalMetricStatus is an autogenerated conversion function.
+func Convert_autoscaling_ExternalMetricStatus_To_v2beta1_ExternalMetricStatus(in *autoscaling.ExternalMetricStatus, out *v2beta1.ExternalMetricStatus, s conversion.Scope) error {
+	return autoConvert_autoscaling_ExternalMetricStatus_To_v2beta1_ExternalMetricStatus(in, out, s)
+}
+
 func autoConvert_v2beta1_HorizontalPodAutoscaler_To_autoscaling_HorizontalPodAutoscaler(in *v2beta1.HorizontalPodAutoscaler, out *autoscaling.HorizontalPodAutoscaler, s conversion.Scope) error {
 	out.ObjectMeta = in.ObjectMeta
 	if err := Convert_v2beta1_HorizontalPodAutoscalerSpec_To_autoscaling_HorizontalPodAutoscalerSpec(&in.Spec, &out.Spec, s); err != nil {
@@ -144,7 +200,7 @@ func Convert_v2beta1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalP
 
 func autoConvert_autoscaling_HorizontalPodAutoscalerCondition_To_v2beta1_HorizontalPodAutoscalerCondition(in *autoscaling.HorizontalPodAutoscalerCondition, out *v2beta1.HorizontalPodAutoscalerCondition, s conversion.Scope) error {
 	out.Type = v2beta1.HorizontalPodAutoscalerConditionType(in.Type)
-	out.Status = v1.ConditionStatus(in.Status)
+	out.Status = core_v1.ConditionStatus(in.Status)
 	out.LastTransitionTime = in.LastTransitionTime
 	out.Reason = in.Reason
 	out.Message = in.Message
@@ -210,7 +266,7 @@ func Convert_autoscaling_HorizontalPodAutoscalerSpec_To_v2beta1_HorizontalPodAut
 
 func autoConvert_v2beta1_HorizontalPodAutoscalerStatus_To_autoscaling_HorizontalPodAutoscalerStatus(in *v2beta1.HorizontalPodAutoscalerStatus, out *autoscaling.HorizontalPodAutoscalerStatus, s conversion.Scope) error {
 	out.ObservedGeneration = (*int64)(unsafe.Pointer(in.ObservedGeneration))
-	out.LastScaleTime = (*meta_v1.Time)(unsafe.Pointer(in.LastScaleTime))
+	out.LastScaleTime = (*v1.Time)(unsafe.Pointer(in.LastScaleTime))
 	out.CurrentReplicas = in.CurrentReplicas
 	out.DesiredReplicas = in.DesiredReplicas
 	out.CurrentMetrics = *(*[]autoscaling.MetricStatus)(unsafe.Pointer(&in.CurrentMetrics))
@@ -225,7 +281,7 @@ func Convert_v2beta1_HorizontalPodAutoscalerStatus_To_autoscaling_HorizontalPodA
 
 func autoConvert_autoscaling_HorizontalPodAutoscalerStatus_To_v2beta1_HorizontalPodAutoscalerStatus(in *autoscaling.HorizontalPodAutoscalerStatus, out *v2beta1.HorizontalPodAutoscalerStatus, s conversion.Scope) error {
 	out.ObservedGeneration = (*int64)(unsafe.Pointer(in.ObservedGeneration))
-	out.LastScaleTime = (*meta_v1.Time)(unsafe.Pointer(in.LastScaleTime))
+	out.LastScaleTime = (*v1.Time)(unsafe.Pointer(in.LastScaleTime))
 	out.CurrentReplicas = in.CurrentReplicas
 	out.DesiredReplicas = in.DesiredReplicas
 	out.CurrentMetrics = *(*[]v2beta1.MetricStatus)(unsafe.Pointer(&in.CurrentMetrics))
@@ -243,6 +299,7 @@ func autoConvert_v2beta1_MetricSpec_To_autoscaling_MetricSpec(in *v2beta1.Metric
 	out.Object = (*autoscaling.ObjectMetricSource)(unsafe.Pointer(in.Object))
 	out.Pods = (*autoscaling.PodsMetricSource)(unsafe.Pointer(in.Pods))
 	out.Resource = (*autoscaling.ResourceMetricSource)(unsafe.Pointer(in.Resource))
+	out.External = (*autoscaling.ExternalMetricSource)(unsafe.Pointer(in.External))
 	return nil
 }
 
@@ -256,6 +313,7 @@ func autoConvert_autoscaling_MetricSpec_To_v2beta1_MetricSpec(in *autoscaling.Me
 	out.Object = (*v2beta1.ObjectMetricSource)(unsafe.Pointer(in.Object))
 	out.Pods = (*v2beta1.PodsMetricSource)(unsafe.Pointer(in.Pods))
 	out.Resource = (*v2beta1.ResourceMetricSource)(unsafe.Pointer(in.Resource))
+	out.External = (*v2beta1.ExternalMetricSource)(unsafe.Pointer(in.External))
 	return nil
 }
 
@@ -269,6 +327,7 @@ func autoConvert_v2beta1_MetricStatus_To_autoscaling_MetricStatus(in *v2beta1.Me
 	out.Object = (*autoscaling.ObjectMetricStatus)(unsafe.Pointer(in.Object))
 	out.Pods = (*autoscaling.PodsMetricStatus)(unsafe.Pointer(in.Pods))
 	out.Resource = (*autoscaling.ResourceMetricStatus)(unsafe.Pointer(in.Resource))
+	out.External = (*autoscaling.ExternalMetricStatus)(unsafe.Pointer(in.External))
 	return nil
 }
 
@@ -282,6 +341,7 @@ func autoConvert_autoscaling_MetricStatus_To_v2beta1_MetricStatus(in *autoscalin
 	out.Object = (*v2beta1.ObjectMetricStatus)(unsafe.Pointer(in.Object))
 	out.Pods = (*v2beta1.PodsMetricStatus)(unsafe.Pointer(in.Pods))
 	out.Resource = (*v2beta1.ResourceMetricStatus)(unsafe.Pointer(in.Resource))
+	out.External = (*v2beta1.ExternalMetricStatus)(unsafe.Pointer(in.External))
 	return nil
 }
 
@@ -403,7 +463,7 @@ func Convert_v2beta1_ResourceMetricSource_To_autoscaling_ResourceMetricSource(in
 }
 
 func autoConvert_autoscaling_ResourceMetricSource_To_v2beta1_ResourceMetricSource(in *autoscaling.ResourceMetricSource, out *v2beta1.ResourceMetricSource, s conversion.Scope) error {
-	out.Name = v1.ResourceName(in.Name)
+	out.Name = core_v1.ResourceName(in.Name)
 	out.TargetAverageUtilization = (*int32)(unsafe.Pointer(in.TargetAverageUtilization))
 	out.TargetAverageValue = (*resource.Quantity)(unsafe.Pointer(in.TargetAverageValue))
 	return nil
@@ -427,7 +487,7 @@ func Convert_v2beta1_ResourceMetricStatus_To_autoscaling_ResourceMetricStatus(in
 }
 
 func autoConvert_autoscaling_ResourceMetricStatus_To_v2beta1_ResourceMetricStatus(in *autoscaling.ResourceMetricStatus, out *v2beta1.ResourceMetricStatus, s conversion.Scope) error {
-	out.Name = v1.ResourceName(in.Name)
+	out.Name = core_v1.ResourceName(in.Name)
 	out.CurrentAverageUtilization = (*int32)(unsafe.Pointer(in.CurrentAverageUtilization))
 	out.CurrentAverageValue = in.CurrentAverageValue
 	return nil
diff --git a/pkg/apis/autoscaling/zz_generated.deepcopy.go b/pkg/apis/autoscaling/zz_generated.deepcopy.go
index 520fa8a577d..fc36f053bd0 100644
--- a/pkg/apis/autoscaling/zz_generated.deepcopy.go
+++ b/pkg/apis/autoscaling/zz_generated.deepcopy.go
@@ -42,6 +42,84 @@ func (in *CrossVersionObjectReference) DeepCopy() *CrossVersionObjectReference {
 	return out
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *ExternalMetricSource) DeepCopyInto(out *ExternalMetricSource) {
+	*out = *in
+	if in.MetricSelector != nil {
+		in, out := &in.MetricSelector, &out.MetricSelector
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(v1.LabelSelector)
+			(*in).DeepCopyInto(*out)
+		}
+	}
+	if in.TargetValue != nil {
+		in, out := &in.TargetValue, &out.TargetValue
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(resource.Quantity)
+			**out = (*in).DeepCopy()
+		}
+	}
+	if in.TargetAverageValue != nil {
+		in, out := &in.TargetAverageValue, &out.TargetAverageValue
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(resource.Quantity)
+			**out = (*in).DeepCopy()
+		}
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new ExternalMetricSource.
+func (in *ExternalMetricSource) DeepCopy() *ExternalMetricSource {
+	if in == nil {
+		return nil
+	}
+	out := new(ExternalMetricSource)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *ExternalMetricStatus) DeepCopyInto(out *ExternalMetricStatus) {
+	*out = *in
+	if in.MetricSelector != nil {
+		in, out := &in.MetricSelector, &out.MetricSelector
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(v1.LabelSelector)
+			(*in).DeepCopyInto(*out)
+		}
+	}
+	out.CurrentValue = in.CurrentValue.DeepCopy()
+	if in.CurrentAverageValue != nil {
+		in, out := &in.CurrentAverageValue, &out.CurrentAverageValue
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(resource.Quantity)
+			**out = (*in).DeepCopy()
+		}
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new ExternalMetricStatus.
+func (in *ExternalMetricStatus) DeepCopy() *ExternalMetricStatus {
+	if in == nil {
+		return nil
+	}
+	out := new(ExternalMetricStatus)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *HorizontalPodAutoscaler) DeepCopyInto(out *HorizontalPodAutoscaler) {
 	*out = *in
@@ -233,6 +311,15 @@ func (in *MetricSpec) DeepCopyInto(out *MetricSpec) {
 			(*in).DeepCopyInto(*out)
 		}
 	}
+	if in.External != nil {
+		in, out := &in.External, &out.External
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(ExternalMetricSource)
+			(*in).DeepCopyInto(*out)
+		}
+	}
 	return
 }
 
@@ -276,6 +363,15 @@ func (in *MetricStatus) DeepCopyInto(out *MetricStatus) {
 			(*in).DeepCopyInto(*out)
 		}
 	}
+	if in.External != nil {
+		in, out := &in.External, &out.External
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(ExternalMetricStatus)
+			(*in).DeepCopyInto(*out)
+		}
+	}
 	return
 }
 
diff --git a/staging/src/k8s.io/api/autoscaling/v1/generated.pb.go b/staging/src/k8s.io/api/autoscaling/v1/generated.pb.go
index 4c6a171279b..9e2b235eb09 100644
--- a/staging/src/k8s.io/api/autoscaling/v1/generated.pb.go
+++ b/staging/src/k8s.io/api/autoscaling/v1/generated.pb.go
@@ -26,6 +26,8 @@ limitations under the License.
 
 	It has these top-level messages:
 		CrossVersionObjectReference
+		ExternalMetricSource
+		ExternalMetricStatus
 		HorizontalPodAutoscaler
 		HorizontalPodAutoscalerCondition
 		HorizontalPodAutoscalerList
@@ -76,80 +78,90 @@ func (*CrossVersionObjectReference) Descriptor() ([]byte, []int) {
 	return fileDescriptorGenerated, []int{0}
 }
 
+func (m *ExternalMetricSource) Reset()                    { *m = ExternalMetricSource{} }
+func (*ExternalMetricSource) ProtoMessage()               {}
+func (*ExternalMetricSource) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{1} }
+
+func (m *ExternalMetricStatus) Reset()                    { *m = ExternalMetricStatus{} }
+func (*ExternalMetricStatus) ProtoMessage()               {}
+func (*ExternalMetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{2} }
+
 func (m *HorizontalPodAutoscaler) Reset()                    { *m = HorizontalPodAutoscaler{} }
 func (*HorizontalPodAutoscaler) ProtoMessage()               {}
-func (*HorizontalPodAutoscaler) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{1} }
+func (*HorizontalPodAutoscaler) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{3} }
 
 func (m *HorizontalPodAutoscalerCondition) Reset()      { *m = HorizontalPodAutoscalerCondition{} }
 func (*HorizontalPodAutoscalerCondition) ProtoMessage() {}
 func (*HorizontalPodAutoscalerCondition) Descriptor() ([]byte, []int) {
-	return fileDescriptorGenerated, []int{2}
+	return fileDescriptorGenerated, []int{4}
 }
 
 func (m *HorizontalPodAutoscalerList) Reset()      { *m = HorizontalPodAutoscalerList{} }
 func (*HorizontalPodAutoscalerList) ProtoMessage() {}
 func (*HorizontalPodAutoscalerList) Descriptor() ([]byte, []int) {
-	return fileDescriptorGenerated, []int{3}
+	return fileDescriptorGenerated, []int{5}
 }
 
 func (m *HorizontalPodAutoscalerSpec) Reset()      { *m = HorizontalPodAutoscalerSpec{} }
 func (*HorizontalPodAutoscalerSpec) ProtoMessage() {}
 func (*HorizontalPodAutoscalerSpec) Descriptor() ([]byte, []int) {
-	return fileDescriptorGenerated, []int{4}
+	return fileDescriptorGenerated, []int{6}
 }
 
 func (m *HorizontalPodAutoscalerStatus) Reset()      { *m = HorizontalPodAutoscalerStatus{} }
 func (*HorizontalPodAutoscalerStatus) ProtoMessage() {}
 func (*HorizontalPodAutoscalerStatus) Descriptor() ([]byte, []int) {
-	return fileDescriptorGenerated, []int{5}
+	return fileDescriptorGenerated, []int{7}
 }
 
 func (m *MetricSpec) Reset()                    { *m = MetricSpec{} }
 func (*MetricSpec) ProtoMessage()               {}
-func (*MetricSpec) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{6} }
+func (*MetricSpec) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{8} }
 
 func (m *MetricStatus) Reset()                    { *m = MetricStatus{} }
 func (*MetricStatus) ProtoMessage()               {}
-func (*MetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{7} }
+func (*MetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{9} }
 
 func (m *ObjectMetricSource) Reset()                    { *m = ObjectMetricSource{} }
 func (*ObjectMetricSource) ProtoMessage()               {}
-func (*ObjectMetricSource) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{8} }
+func (*ObjectMetricSource) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{10} }
 
 func (m *ObjectMetricStatus) Reset()                    { *m = ObjectMetricStatus{} }
 func (*ObjectMetricStatus) ProtoMessage()               {}
-func (*ObjectMetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{9} }
+func (*ObjectMetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{11} }
 
 func (m *PodsMetricSource) Reset()                    { *m = PodsMetricSource{} }
 func (*PodsMetricSource) ProtoMessage()               {}
-func (*PodsMetricSource) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{10} }
+func (*PodsMetricSource) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{12} }
 
 func (m *PodsMetricStatus) Reset()                    { *m = PodsMetricStatus{} }
 func (*PodsMetricStatus) ProtoMessage()               {}
-func (*PodsMetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{11} }
+func (*PodsMetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{13} }
 
 func (m *ResourceMetricSource) Reset()                    { *m = ResourceMetricSource{} }
 func (*ResourceMetricSource) ProtoMessage()               {}
-func (*ResourceMetricSource) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{12} }
+func (*ResourceMetricSource) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{14} }
 
 func (m *ResourceMetricStatus) Reset()                    { *m = ResourceMetricStatus{} }
 func (*ResourceMetricStatus) ProtoMessage()               {}
-func (*ResourceMetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{13} }
+func (*ResourceMetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{15} }
 
 func (m *Scale) Reset()                    { *m = Scale{} }
 func (*Scale) ProtoMessage()               {}
-func (*Scale) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{14} }
+func (*Scale) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{16} }
 
 func (m *ScaleSpec) Reset()                    { *m = ScaleSpec{} }
 func (*ScaleSpec) ProtoMessage()               {}
-func (*ScaleSpec) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{15} }
+func (*ScaleSpec) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{17} }
 
 func (m *ScaleStatus) Reset()                    { *m = ScaleStatus{} }
 func (*ScaleStatus) ProtoMessage()               {}
-func (*ScaleStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{16} }
+func (*ScaleStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{18} }
 
 func init() {
 	proto.RegisterType((*CrossVersionObjectReference)(nil), "k8s.io.api.autoscaling.v1.CrossVersionObjectReference")
+	proto.RegisterType((*ExternalMetricSource)(nil), "k8s.io.api.autoscaling.v1.ExternalMetricSource")
+	proto.RegisterType((*ExternalMetricStatus)(nil), "k8s.io.api.autoscaling.v1.ExternalMetricStatus")
 	proto.RegisterType((*HorizontalPodAutoscaler)(nil), "k8s.io.api.autoscaling.v1.HorizontalPodAutoscaler")
 	proto.RegisterType((*HorizontalPodAutoscalerCondition)(nil), "k8s.io.api.autoscaling.v1.HorizontalPodAutoscalerCondition")
 	proto.RegisterType((*HorizontalPodAutoscalerList)(nil), "k8s.io.api.autoscaling.v1.HorizontalPodAutoscalerList")
@@ -197,6 +209,108 @@ func (m *CrossVersionObjectReference) MarshalTo(dAtA []byte) (int, error) {
 	return i, nil
 }
 
+func (m *ExternalMetricSource) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalTo(dAtA)
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *ExternalMetricSource) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	dAtA[i] = 0xa
+	i++
+	i = encodeVarintGenerated(dAtA, i, uint64(len(m.MetricName)))
+	i += copy(dAtA[i:], m.MetricName)
+	if m.MetricSelector != nil {
+		dAtA[i] = 0x12
+		i++
+		i = encodeVarintGenerated(dAtA, i, uint64(m.MetricSelector.Size()))
+		n1, err := m.MetricSelector.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n1
+	}
+	if m.TargetValue != nil {
+		dAtA[i] = 0x1a
+		i++
+		i = encodeVarintGenerated(dAtA, i, uint64(m.TargetValue.Size()))
+		n2, err := m.TargetValue.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n2
+	}
+	if m.TargetAverageValue != nil {
+		dAtA[i] = 0x22
+		i++
+		i = encodeVarintGenerated(dAtA, i, uint64(m.TargetAverageValue.Size()))
+		n3, err := m.TargetAverageValue.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n3
+	}
+	return i, nil
+}
+
+func (m *ExternalMetricStatus) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalTo(dAtA)
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *ExternalMetricStatus) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	dAtA[i] = 0xa
+	i++
+	i = encodeVarintGenerated(dAtA, i, uint64(len(m.MetricName)))
+	i += copy(dAtA[i:], m.MetricName)
+	if m.MetricSelector != nil {
+		dAtA[i] = 0x12
+		i++
+		i = encodeVarintGenerated(dAtA, i, uint64(m.MetricSelector.Size()))
+		n4, err := m.MetricSelector.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n4
+	}
+	dAtA[i] = 0x1a
+	i++
+	i = encodeVarintGenerated(dAtA, i, uint64(m.CurrentValue.Size()))
+	n5, err := m.CurrentValue.MarshalTo(dAtA[i:])
+	if err != nil {
+		return 0, err
+	}
+	i += n5
+	if m.CurrentAverageValue != nil {
+		dAtA[i] = 0x22
+		i++
+		i = encodeVarintGenerated(dAtA, i, uint64(m.CurrentAverageValue.Size()))
+		n6, err := m.CurrentAverageValue.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n6
+	}
+	return i, nil
+}
+
 func (m *HorizontalPodAutoscaler) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
@@ -215,27 +329,27 @@ func (m *HorizontalPodAutoscaler) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.ObjectMeta.Size()))
-	n1, err := m.ObjectMeta.MarshalTo(dAtA[i:])
+	n7, err := m.ObjectMeta.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n1
+	i += n7
 	dAtA[i] = 0x12
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.Spec.Size()))
-	n2, err := m.Spec.MarshalTo(dAtA[i:])
+	n8, err := m.Spec.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n2
+	i += n8
 	dAtA[i] = 0x1a
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.Status.Size()))
-	n3, err := m.Status.MarshalTo(dAtA[i:])
+	n9, err := m.Status.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n3
+	i += n9
 	return i, nil
 }
 
@@ -265,11 +379,11 @@ func (m *HorizontalPodAutoscalerCondition) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0x1a
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.LastTransitionTime.Size()))
-	n4, err := m.LastTransitionTime.MarshalTo(dAtA[i:])
+	n10, err := m.LastTransitionTime.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n4
+	i += n10
 	dAtA[i] = 0x22
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(len(m.Reason)))
@@ -299,11 +413,11 @@ func (m *HorizontalPodAutoscalerList) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.ListMeta.Size()))
-	n5, err := m.ListMeta.MarshalTo(dAtA[i:])
+	n11, err := m.ListMeta.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n5
+	i += n11
 	if len(m.Items) > 0 {
 		for _, msg := range m.Items {
 			dAtA[i] = 0x12
@@ -337,11 +451,11 @@ func (m *HorizontalPodAutoscalerSpec) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.ScaleTargetRef.Size()))
-	n6, err := m.ScaleTargetRef.MarshalTo(dAtA[i:])
+	n12, err := m.ScaleTargetRef.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n6
+	i += n12
 	if m.MinReplicas != nil {
 		dAtA[i] = 0x10
 		i++
@@ -382,11 +496,11 @@ func (m *HorizontalPodAutoscalerStatus) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0x12
 		i++
 		i = encodeVarintGenerated(dAtA, i, uint64(m.LastScaleTime.Size()))
-		n7, err := m.LastScaleTime.MarshalTo(dAtA[i:])
+		n13, err := m.LastScaleTime.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n7
+		i += n13
 	}
 	dAtA[i] = 0x18
 	i++
@@ -425,31 +539,41 @@ func (m *MetricSpec) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0x12
 		i++
 		i = encodeVarintGenerated(dAtA, i, uint64(m.Object.Size()))
-		n8, err := m.Object.MarshalTo(dAtA[i:])
+		n14, err := m.Object.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n8
+		i += n14
 	}
 	if m.Pods != nil {
 		dAtA[i] = 0x1a
 		i++
 		i = encodeVarintGenerated(dAtA, i, uint64(m.Pods.Size()))
-		n9, err := m.Pods.MarshalTo(dAtA[i:])
+		n15, err := m.Pods.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n9
+		i += n15
 	}
 	if m.Resource != nil {
 		dAtA[i] = 0x22
 		i++
 		i = encodeVarintGenerated(dAtA, i, uint64(m.Resource.Size()))
-		n10, err := m.Resource.MarshalTo(dAtA[i:])
+		n16, err := m.Resource.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n10
+		i += n16
+	}
+	if m.External != nil {
+		dAtA[i] = 0x2a
+		i++
+		i = encodeVarintGenerated(dAtA, i, uint64(m.External.Size()))
+		n17, err := m.External.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n17
 	}
 	return i, nil
 }
@@ -477,31 +601,41 @@ func (m *MetricStatus) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0x12
 		i++
 		i = encodeVarintGenerated(dAtA, i, uint64(m.Object.Size()))
-		n11, err := m.Object.MarshalTo(dAtA[i:])
+		n18, err := m.Object.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n11
+		i += n18
 	}
 	if m.Pods != nil {
 		dAtA[i] = 0x1a
 		i++
 		i = encodeVarintGenerated(dAtA, i, uint64(m.Pods.Size()))
-		n12, err := m.Pods.MarshalTo(dAtA[i:])
+		n19, err := m.Pods.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n12
+		i += n19
 	}
 	if m.Resource != nil {
 		dAtA[i] = 0x22
 		i++
 		i = encodeVarintGenerated(dAtA, i, uint64(m.Resource.Size()))
-		n13, err := m.Resource.MarshalTo(dAtA[i:])
+		n20, err := m.Resource.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n13
+		i += n20
+	}
+	if m.External != nil {
+		dAtA[i] = 0x2a
+		i++
+		i = encodeVarintGenerated(dAtA, i, uint64(m.External.Size()))
+		n21, err := m.External.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n21
 	}
 	return i, nil
 }
@@ -524,11 +658,11 @@ func (m *ObjectMetricSource) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.Target.Size()))
-	n14, err := m.Target.MarshalTo(dAtA[i:])
+	n22, err := m.Target.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n14
+	i += n22
 	dAtA[i] = 0x12
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(len(m.MetricName)))
@@ -536,11 +670,11 @@ func (m *ObjectMetricSource) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0x1a
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.TargetValue.Size()))
-	n15, err := m.TargetValue.MarshalTo(dAtA[i:])
+	n23, err := m.TargetValue.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n15
+	i += n23
 	return i, nil
 }
 
@@ -562,11 +696,11 @@ func (m *ObjectMetricStatus) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.Target.Size()))
-	n16, err := m.Target.MarshalTo(dAtA[i:])
+	n24, err := m.Target.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n16
+	i += n24
 	dAtA[i] = 0x12
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(len(m.MetricName)))
@@ -574,11 +708,11 @@ func (m *ObjectMetricStatus) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0x1a
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.CurrentValue.Size()))
-	n17, err := m.CurrentValue.MarshalTo(dAtA[i:])
+	n25, err := m.CurrentValue.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n17
+	i += n25
 	return i, nil
 }
 
@@ -604,11 +738,11 @@ func (m *PodsMetricSource) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0x12
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.TargetAverageValue.Size()))
-	n18, err := m.TargetAverageValue.MarshalTo(dAtA[i:])
+	n26, err := m.TargetAverageValue.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n18
+	i += n26
 	return i, nil
 }
 
@@ -634,11 +768,11 @@ func (m *PodsMetricStatus) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0x12
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.CurrentAverageValue.Size()))
-	n19, err := m.CurrentAverageValue.MarshalTo(dAtA[i:])
+	n27, err := m.CurrentAverageValue.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n19
+	i += n27
 	return i, nil
 }
 
@@ -670,11 +804,11 @@ func (m *ResourceMetricSource) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0x1a
 		i++
 		i = encodeVarintGenerated(dAtA, i, uint64(m.TargetAverageValue.Size()))
-		n20, err := m.TargetAverageValue.MarshalTo(dAtA[i:])
+		n28, err := m.TargetAverageValue.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n20
+		i += n28
 	}
 	return i, nil
 }
@@ -706,11 +840,11 @@ func (m *ResourceMetricStatus) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0x1a
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.CurrentAverageValue.Size()))
-	n21, err := m.CurrentAverageValue.MarshalTo(dAtA[i:])
+	n29, err := m.CurrentAverageValue.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n21
+	i += n29
 	return i, nil
 }
 
@@ -732,27 +866,27 @@ func (m *Scale) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.ObjectMeta.Size()))
-	n22, err := m.ObjectMeta.MarshalTo(dAtA[i:])
+	n30, err := m.ObjectMeta.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n22
+	i += n30
 	dAtA[i] = 0x12
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.Spec.Size()))
-	n23, err := m.Spec.MarshalTo(dAtA[i:])
+	n31, err := m.Spec.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n23
+	i += n31
 	dAtA[i] = 0x1a
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.Status.Size()))
-	n24, err := m.Status.MarshalTo(dAtA[i:])
+	n32, err := m.Status.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n24
+	i += n32
 	return i, nil
 }
 
@@ -841,6 +975,44 @@ func (m *CrossVersionObjectReference) Size() (n int) {
 	return n
 }
 
+func (m *ExternalMetricSource) Size() (n int) {
+	var l int
+	_ = l
+	l = len(m.MetricName)
+	n += 1 + l + sovGenerated(uint64(l))
+	if m.MetricSelector != nil {
+		l = m.MetricSelector.Size()
+		n += 1 + l + sovGenerated(uint64(l))
+	}
+	if m.TargetValue != nil {
+		l = m.TargetValue.Size()
+		n += 1 + l + sovGenerated(uint64(l))
+	}
+	if m.TargetAverageValue != nil {
+		l = m.TargetAverageValue.Size()
+		n += 1 + l + sovGenerated(uint64(l))
+	}
+	return n
+}
+
+func (m *ExternalMetricStatus) Size() (n int) {
+	var l int
+	_ = l
+	l = len(m.MetricName)
+	n += 1 + l + sovGenerated(uint64(l))
+	if m.MetricSelector != nil {
+		l = m.MetricSelector.Size()
+		n += 1 + l + sovGenerated(uint64(l))
+	}
+	l = m.CurrentValue.Size()
+	n += 1 + l + sovGenerated(uint64(l))
+	if m.CurrentAverageValue != nil {
+		l = m.CurrentAverageValue.Size()
+		n += 1 + l + sovGenerated(uint64(l))
+	}
+	return n
+}
+
 func (m *HorizontalPodAutoscaler) Size() (n int) {
 	var l int
 	_ = l
@@ -933,6 +1105,10 @@ func (m *MetricSpec) Size() (n int) {
 		l = m.Resource.Size()
 		n += 1 + l + sovGenerated(uint64(l))
 	}
+	if m.External != nil {
+		l = m.External.Size()
+		n += 1 + l + sovGenerated(uint64(l))
+	}
 	return n
 }
 
@@ -953,6 +1129,10 @@ func (m *MetricStatus) Size() (n int) {
 		l = m.Resource.Size()
 		n += 1 + l + sovGenerated(uint64(l))
 	}
+	if m.External != nil {
+		l = m.External.Size()
+		n += 1 + l + sovGenerated(uint64(l))
+	}
 	return n
 }
 
@@ -1081,6 +1261,32 @@ func (this *CrossVersionObjectReference) String() string {
 	}, "")
 	return s
 }
+func (this *ExternalMetricSource) String() string {
+	if this == nil {
+		return "nil"
+	}
+	s := strings.Join([]string{`&ExternalMetricSource{`,
+		`MetricName:` + fmt.Sprintf("%v", this.MetricName) + `,`,
+		`MetricSelector:` + strings.Replace(fmt.Sprintf("%v", this.MetricSelector), "LabelSelector", "k8s_io_apimachinery_pkg_apis_meta_v1.LabelSelector", 1) + `,`,
+		`TargetValue:` + strings.Replace(fmt.Sprintf("%v", this.TargetValue), "Quantity", "k8s_io_apimachinery_pkg_api_resource.Quantity", 1) + `,`,
+		`TargetAverageValue:` + strings.Replace(fmt.Sprintf("%v", this.TargetAverageValue), "Quantity", "k8s_io_apimachinery_pkg_api_resource.Quantity", 1) + `,`,
+		`}`,
+	}, "")
+	return s
+}
+func (this *ExternalMetricStatus) String() string {
+	if this == nil {
+		return "nil"
+	}
+	s := strings.Join([]string{`&ExternalMetricStatus{`,
+		`MetricName:` + fmt.Sprintf("%v", this.MetricName) + `,`,
+		`MetricSelector:` + strings.Replace(fmt.Sprintf("%v", this.MetricSelector), "LabelSelector", "k8s_io_apimachinery_pkg_apis_meta_v1.LabelSelector", 1) + `,`,
+		`CurrentValue:` + strings.Replace(strings.Replace(this.CurrentValue.String(), "Quantity", "k8s_io_apimachinery_pkg_api_resource.Quantity", 1), `&`, ``, 1) + `,`,
+		`CurrentAverageValue:` + strings.Replace(fmt.Sprintf("%v", this.CurrentAverageValue), "Quantity", "k8s_io_apimachinery_pkg_api_resource.Quantity", 1) + `,`,
+		`}`,
+	}, "")
+	return s
+}
 func (this *HorizontalPodAutoscaler) String() string {
 	if this == nil {
 		return "nil"
@@ -1154,6 +1360,7 @@ func (this *MetricSpec) String() string {
 		`Object:` + strings.Replace(fmt.Sprintf("%v", this.Object), "ObjectMetricSource", "ObjectMetricSource", 1) + `,`,
 		`Pods:` + strings.Replace(fmt.Sprintf("%v", this.Pods), "PodsMetricSource", "PodsMetricSource", 1) + `,`,
 		`Resource:` + strings.Replace(fmt.Sprintf("%v", this.Resource), "ResourceMetricSource", "ResourceMetricSource", 1) + `,`,
+		`External:` + strings.Replace(fmt.Sprintf("%v", this.External), "ExternalMetricSource", "ExternalMetricSource", 1) + `,`,
 		`}`,
 	}, "")
 	return s
@@ -1167,6 +1374,7 @@ func (this *MetricStatus) String() string {
 		`Object:` + strings.Replace(fmt.Sprintf("%v", this.Object), "ObjectMetricStatus", "ObjectMetricStatus", 1) + `,`,
 		`Pods:` + strings.Replace(fmt.Sprintf("%v", this.Pods), "PodsMetricStatus", "PodsMetricStatus", 1) + `,`,
 		`Resource:` + strings.Replace(fmt.Sprintf("%v", this.Resource), "ResourceMetricStatus", "ResourceMetricStatus", 1) + `,`,
+		`External:` + strings.Replace(fmt.Sprintf("%v", this.External), "ExternalMetricStatus", "ExternalMetricStatus", 1) + `,`,
 		`}`,
 	}, "")
 	return s
@@ -1419,6 +1627,359 @@ func (m *CrossVersionObjectReference) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *ExternalMetricSource) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowGenerated
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: ExternalMetricSource: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: ExternalMetricSource: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field MetricName", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.MetricName = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field MetricSelector", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.MetricSelector == nil {
+				m.MetricSelector = &k8s_io_apimachinery_pkg_apis_meta_v1.LabelSelector{}
+			}
+			if err := m.MetricSelector.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		case 3:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field TargetValue", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.TargetValue == nil {
+				m.TargetValue = &k8s_io_apimachinery_pkg_api_resource.Quantity{}
+			}
+			if err := m.TargetValue.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		case 4:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field TargetAverageValue", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.TargetAverageValue == nil {
+				m.TargetAverageValue = &k8s_io_apimachinery_pkg_api_resource.Quantity{}
+			}
+			if err := m.TargetAverageValue.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipGenerated(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *ExternalMetricStatus) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowGenerated
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: ExternalMetricStatus: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: ExternalMetricStatus: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field MetricName", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.MetricName = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field MetricSelector", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.MetricSelector == nil {
+				m.MetricSelector = &k8s_io_apimachinery_pkg_apis_meta_v1.LabelSelector{}
+			}
+			if err := m.MetricSelector.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		case 3:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field CurrentValue", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if err := m.CurrentValue.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		case 4:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field CurrentAverageValue", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.CurrentAverageValue == nil {
+				m.CurrentAverageValue = &k8s_io_apimachinery_pkg_api_resource.Quantity{}
+			}
+			if err := m.CurrentAverageValue.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipGenerated(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func (m *HorizontalPodAutoscaler) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0
@@ -2323,6 +2884,39 @@ func (m *MetricSpec) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 5:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field External", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.External == nil {
+				m.External = &ExternalMetricSource{}
+			}
+			if err := m.External.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipGenerated(dAtA[iNdEx:])
@@ -2501,6 +3095,39 @@ func (m *MetricStatus) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 5:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field External", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.External == nil {
+				m.External = &ExternalMetricStatus{}
+			}
+			if err := m.External.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipGenerated(dAtA[iNdEx:])
@@ -3696,91 +4323,98 @@ func init() {
 }
 
 var fileDescriptorGenerated = []byte{
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+	// 1485 bytes of a gzipped FileDescriptorProto
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+	0x2b, 0x84, 0x6f, 0x89, 0x22, 0xaf, 0xbb, 0xe1, 0x9c, 0xf4, 0x6d, 0x3c, 0x1b, 0xc6, 0x6d, 0x70,
+	0xcc, 0x61, 0x52, 0x50, 0x4a, 0x68, 0xd8, 0x9b, 0xb0, 0xe0, 0x0e, 0x92, 0x0f, 0x5d, 0x53, 0x3d,
+	0xee, 0xf8, 0xc5, 0x2a, 0xe6, 0xa8, 0x5c, 0x78, 0xfa, 0xa2, 0x3c, 0xf6, 0xec, 0x45, 0x79, 0xec,
+	0xf9, 0x8b, 0xf2, 0xd8, 0x97, 0x51, 0x39, 0xf7, 0x34, 0x2a, 0xe7, 0x9e, 0x45, 0xe5, 0xdc, 0xf3,
+	0xa8, 0x9c, 0xfb, 0x23, 0x2a, 0xe7, 0xbe, 0xfd, 0xb3, 0x3c, 0xf6, 0x49, 0xbe, 0xb3, 0xf8, 0x77,
+	0x00, 0x00, 0x00, 0xff, 0xff, 0x61, 0x55, 0xfd, 0xeb, 0x81, 0x17, 0x00, 0x00,
 }
diff --git a/staging/src/k8s.io/api/autoscaling/v1/generated.proto b/staging/src/k8s.io/api/autoscaling/v1/generated.proto
index 33eecf4de06..64f01f477b1 100644
--- a/staging/src/k8s.io/api/autoscaling/v1/generated.proto
+++ b/staging/src/k8s.io/api/autoscaling/v1/generated.proto
@@ -44,6 +44,49 @@ message CrossVersionObjectReference {
   optional string apiVersion = 3;
 }
 
+// ExternalMetricSource indicates how to scale on a metric not associated with
+// any Kubernetes object (for example length of queue in cloud
+// messaging service, or QPS from loadbalancer running outside of cluster).
+message ExternalMetricSource {
+  // metricName is the name of the metric in question.
+  optional string metricName = 1;
+
+  // metricSelector is used to identify a specific time series
+  // within a given metric.
+  // +optional
+  optional k8s.io.apimachinery.pkg.apis.meta.v1.LabelSelector metricSelector = 2;
+
+  // targetValue is the target value of the metric (as a quantity).
+  // Mutually exclusive with TargetAverageValue.
+  // +optional
+  optional k8s.io.apimachinery.pkg.api.resource.Quantity targetValue = 3;
+
+  // targetAverageValue is the target per-pod value of global metric (as a quantity).
+  // Mutually exclusive with TargetValue.
+  // +optional
+  optional k8s.io.apimachinery.pkg.api.resource.Quantity targetAverageValue = 4;
+}
+
+// ExternalMetricStatus indicates the current value of a global metric
+// not associated with any Kubernetes object.
+message ExternalMetricStatus {
+  // metricName is the name of a metric used for autoscaling in
+  // metric system.
+  optional string metricName = 1;
+
+  // metricSelector is used to identify a specific time series
+  // within a given metric.
+  // +optional
+  optional k8s.io.apimachinery.pkg.apis.meta.v1.LabelSelector metricSelector = 2;
+
+  // currentValue is the current value of the metric (as a quantity)
+  optional k8s.io.apimachinery.pkg.api.resource.Quantity currentValue = 3;
+
+  // currentAverageValue is the current value of metric averaged over autoscaled pods.
+  // +optional
+  optional k8s.io.apimachinery.pkg.api.resource.Quantity currentAverageValue = 4;
+}
+
 // configuration of a horizontal pod autoscaler.
 message HorizontalPodAutoscaler {
   // Standard object metadata. More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#metadata
@@ -160,6 +203,14 @@ message MetricSpec {
   // to normal per-pod metrics using the "pods" source.
   // +optional
   optional ResourceMetricSource resource = 4;
+
+  // external refers to a global metric that is not associated
+  // with any Kubernetes object. It allows autoscaling based on information
+  // coming from components running outside of cluster
+  // (for example length of queue in cloud messaging service, or
+  // QPS from loadbalancer running outside of cluster).
+  // +optional
+  optional ExternalMetricSource external = 5;
 }
 
 // MetricStatus describes the last-read state of a single metric.
@@ -186,6 +237,14 @@ message MetricStatus {
   // to normal per-pod metrics using the "pods" source.
   // +optional
   optional ResourceMetricStatus resource = 4;
+
+  // external refers to a global metric that is not associated
+  // with any Kubernetes object. It allows autoscaling based on information
+  // coming from components running outside of cluster
+  // (for example length of queue in cloud messaging service, or
+  // QPS from loadbalancer running outside of cluster).
+  // +optional
+  optional ExternalMetricStatus external = 5;
 }
 
 // ObjectMetricSource indicates how to scale on a metric describing a
diff --git a/staging/src/k8s.io/api/autoscaling/v1/types_swagger_doc_generated.go b/staging/src/k8s.io/api/autoscaling/v1/types_swagger_doc_generated.go
index 5506b76f3df..ec364f53eab 100644
--- a/staging/src/k8s.io/api/autoscaling/v1/types_swagger_doc_generated.go
+++ b/staging/src/k8s.io/api/autoscaling/v1/types_swagger_doc_generated.go
@@ -38,6 +38,30 @@ func (CrossVersionObjectReference) SwaggerDoc() map[string]string {
 	return map_CrossVersionObjectReference
 }
 
+var map_ExternalMetricSource = map[string]string{
+	"":                   "ExternalMetricSource indicates how to scale on a metric not associated with any Kubernetes object (for example length of queue in cloud messaging service, or QPS from loadbalancer running outside of cluster).",
+	"metricName":         "metricName is the name of the metric in question.",
+	"metricSelector":     "metricSelector is used to identify a specific time series within a given metric.",
+	"targetValue":        "targetValue is the target value of the metric (as a quantity). Mutually exclusive with TargetAverageValue.",
+	"targetAverageValue": "targetAverageValue is the target per-pod value of global metric (as a quantity). Mutually exclusive with TargetValue.",
+}
+
+func (ExternalMetricSource) SwaggerDoc() map[string]string {
+	return map_ExternalMetricSource
+}
+
+var map_ExternalMetricStatus = map[string]string{
+	"":                    "ExternalMetricStatus indicates the current value of a global metric not associated with any Kubernetes object.",
+	"metricName":          "metricName is the name of a metric used for autoscaling in metric system.",
+	"metricSelector":      "metricSelector is used to identify a specific time series within a given metric.",
+	"currentValue":        "currentValue is the current value of the metric (as a quantity)",
+	"currentAverageValue": "currentAverageValue is the current value of metric averaged over autoscaled pods.",
+}
+
+func (ExternalMetricStatus) SwaggerDoc() map[string]string {
+	return map_ExternalMetricStatus
+}
+
 var map_HorizontalPodAutoscaler = map[string]string{
 	"":         "configuration of a horizontal pod autoscaler.",
 	"metadata": "Standard object metadata. More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#metadata",
@@ -103,6 +127,7 @@ var map_MetricSpec = map[string]string{
 	"object":   "object refers to a metric describing a single kubernetes object (for example, hits-per-second on an Ingress object).",
 	"pods":     "pods refers to a metric describing each pod in the current scale target (for example, transactions-processed-per-second).  The values will be averaged together before being compared to the target value.",
 	"resource": "resource refers to a resource metric (such as those specified in requests and limits) known to Kubernetes describing each pod in the current scale target (e.g. CPU or memory). Such metrics are built in to Kubernetes, and have special scaling options on top of those available to normal per-pod metrics using the \"pods\" source.",
+	"external": "external refers to a global metric that is not associated with any Kubernetes object. It allows autoscaling based on information coming from components running outside of cluster (for example length of queue in cloud messaging service, or QPS from loadbalancer running outside of cluster).",
 }
 
 func (MetricSpec) SwaggerDoc() map[string]string {
@@ -115,6 +140,7 @@ var map_MetricStatus = map[string]string{
 	"object":   "object refers to a metric describing a single kubernetes object (for example, hits-per-second on an Ingress object).",
 	"pods":     "pods refers to a metric describing each pod in the current scale target (for example, transactions-processed-per-second).  The values will be averaged together before being compared to the target value.",
 	"resource": "resource refers to a resource metric (such as those specified in requests and limits) known to Kubernetes describing each pod in the current scale target (e.g. CPU or memory). Such metrics are built in to Kubernetes, and have special scaling options on top of those available to normal per-pod metrics using the \"pods\" source.",
+	"external": "external refers to a global metric that is not associated with any Kubernetes object. It allows autoscaling based on information coming from components running outside of cluster (for example length of queue in cloud messaging service, or QPS from loadbalancer running outside of cluster).",
 }
 
 func (MetricStatus) SwaggerDoc() map[string]string {
diff --git a/staging/src/k8s.io/api/autoscaling/v1/zz_generated.deepcopy.go b/staging/src/k8s.io/api/autoscaling/v1/zz_generated.deepcopy.go
index 3622cf450a9..46f242c8915 100644
--- a/staging/src/k8s.io/api/autoscaling/v1/zz_generated.deepcopy.go
+++ b/staging/src/k8s.io/api/autoscaling/v1/zz_generated.deepcopy.go
@@ -42,6 +42,84 @@ func (in *CrossVersionObjectReference) DeepCopy() *CrossVersionObjectReference {
 	return out
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *ExternalMetricSource) DeepCopyInto(out *ExternalMetricSource) {
+	*out = *in
+	if in.MetricSelector != nil {
+		in, out := &in.MetricSelector, &out.MetricSelector
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(meta_v1.LabelSelector)
+			(*in).DeepCopyInto(*out)
+		}
+	}
+	if in.TargetValue != nil {
+		in, out := &in.TargetValue, &out.TargetValue
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(resource.Quantity)
+			**out = (*in).DeepCopy()
+		}
+	}
+	if in.TargetAverageValue != nil {
+		in, out := &in.TargetAverageValue, &out.TargetAverageValue
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(resource.Quantity)
+			**out = (*in).DeepCopy()
+		}
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new ExternalMetricSource.
+func (in *ExternalMetricSource) DeepCopy() *ExternalMetricSource {
+	if in == nil {
+		return nil
+	}
+	out := new(ExternalMetricSource)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *ExternalMetricStatus) DeepCopyInto(out *ExternalMetricStatus) {
+	*out = *in
+	if in.MetricSelector != nil {
+		in, out := &in.MetricSelector, &out.MetricSelector
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(meta_v1.LabelSelector)
+			(*in).DeepCopyInto(*out)
+		}
+	}
+	out.CurrentValue = in.CurrentValue.DeepCopy()
+	if in.CurrentAverageValue != nil {
+		in, out := &in.CurrentAverageValue, &out.CurrentAverageValue
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(resource.Quantity)
+			**out = (*in).DeepCopy()
+		}
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new ExternalMetricStatus.
+func (in *ExternalMetricStatus) DeepCopy() *ExternalMetricStatus {
+	if in == nil {
+		return nil
+	}
+	out := new(ExternalMetricStatus)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *HorizontalPodAutoscaler) DeepCopyInto(out *HorizontalPodAutoscaler) {
 	*out = *in
@@ -230,6 +308,15 @@ func (in *MetricSpec) DeepCopyInto(out *MetricSpec) {
 			(*in).DeepCopyInto(*out)
 		}
 	}
+	if in.External != nil {
+		in, out := &in.External, &out.External
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(ExternalMetricSource)
+			(*in).DeepCopyInto(*out)
+		}
+	}
 	return
 }
 
@@ -273,6 +360,15 @@ func (in *MetricStatus) DeepCopyInto(out *MetricStatus) {
 			(*in).DeepCopyInto(*out)
 		}
 	}
+	if in.External != nil {
+		in, out := &in.External, &out.External
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(ExternalMetricStatus)
+			(*in).DeepCopyInto(*out)
+		}
+	}
 	return
 }
 
diff --git a/staging/src/k8s.io/api/autoscaling/v2beta1/generated.pb.go b/staging/src/k8s.io/api/autoscaling/v2beta1/generated.pb.go
index 908c049ed3d..784e4be2bf3 100644
--- a/staging/src/k8s.io/api/autoscaling/v2beta1/generated.pb.go
+++ b/staging/src/k8s.io/api/autoscaling/v2beta1/generated.pb.go
@@ -26,6 +26,8 @@ limitations under the License.
 
 	It has these top-level messages:
 		CrossVersionObjectReference
+		ExternalMetricSource
+		ExternalMetricStatus
 		HorizontalPodAutoscaler
 		HorizontalPodAutoscalerCondition
 		HorizontalPodAutoscalerList
@@ -73,68 +75,78 @@ func (*CrossVersionObjectReference) Descriptor() ([]byte, []int) {
 	return fileDescriptorGenerated, []int{0}
 }
 
+func (m *ExternalMetricSource) Reset()                    { *m = ExternalMetricSource{} }
+func (*ExternalMetricSource) ProtoMessage()               {}
+func (*ExternalMetricSource) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{1} }
+
+func (m *ExternalMetricStatus) Reset()                    { *m = ExternalMetricStatus{} }
+func (*ExternalMetricStatus) ProtoMessage()               {}
+func (*ExternalMetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{2} }
+
 func (m *HorizontalPodAutoscaler) Reset()                    { *m = HorizontalPodAutoscaler{} }
 func (*HorizontalPodAutoscaler) ProtoMessage()               {}
-func (*HorizontalPodAutoscaler) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{1} }
+func (*HorizontalPodAutoscaler) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{3} }
 
 func (m *HorizontalPodAutoscalerCondition) Reset()      { *m = HorizontalPodAutoscalerCondition{} }
 func (*HorizontalPodAutoscalerCondition) ProtoMessage() {}
 func (*HorizontalPodAutoscalerCondition) Descriptor() ([]byte, []int) {
-	return fileDescriptorGenerated, []int{2}
+	return fileDescriptorGenerated, []int{4}
 }
 
 func (m *HorizontalPodAutoscalerList) Reset()      { *m = HorizontalPodAutoscalerList{} }
 func (*HorizontalPodAutoscalerList) ProtoMessage() {}
 func (*HorizontalPodAutoscalerList) Descriptor() ([]byte, []int) {
-	return fileDescriptorGenerated, []int{3}
+	return fileDescriptorGenerated, []int{5}
 }
 
 func (m *HorizontalPodAutoscalerSpec) Reset()      { *m = HorizontalPodAutoscalerSpec{} }
 func (*HorizontalPodAutoscalerSpec) ProtoMessage() {}
 func (*HorizontalPodAutoscalerSpec) Descriptor() ([]byte, []int) {
-	return fileDescriptorGenerated, []int{4}
+	return fileDescriptorGenerated, []int{6}
 }
 
 func (m *HorizontalPodAutoscalerStatus) Reset()      { *m = HorizontalPodAutoscalerStatus{} }
 func (*HorizontalPodAutoscalerStatus) ProtoMessage() {}
 func (*HorizontalPodAutoscalerStatus) Descriptor() ([]byte, []int) {
-	return fileDescriptorGenerated, []int{5}
+	return fileDescriptorGenerated, []int{7}
 }
 
 func (m *MetricSpec) Reset()                    { *m = MetricSpec{} }
 func (*MetricSpec) ProtoMessage()               {}
-func (*MetricSpec) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{6} }
+func (*MetricSpec) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{8} }
 
 func (m *MetricStatus) Reset()                    { *m = MetricStatus{} }
 func (*MetricStatus) ProtoMessage()               {}
-func (*MetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{7} }
+func (*MetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{9} }
 
 func (m *ObjectMetricSource) Reset()                    { *m = ObjectMetricSource{} }
 func (*ObjectMetricSource) ProtoMessage()               {}
-func (*ObjectMetricSource) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{8} }
+func (*ObjectMetricSource) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{10} }
 
 func (m *ObjectMetricStatus) Reset()                    { *m = ObjectMetricStatus{} }
 func (*ObjectMetricStatus) ProtoMessage()               {}
-func (*ObjectMetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{9} }
+func (*ObjectMetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{11} }
 
 func (m *PodsMetricSource) Reset()                    { *m = PodsMetricSource{} }
 func (*PodsMetricSource) ProtoMessage()               {}
-func (*PodsMetricSource) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{10} }
+func (*PodsMetricSource) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{12} }
 
 func (m *PodsMetricStatus) Reset()                    { *m = PodsMetricStatus{} }
 func (*PodsMetricStatus) ProtoMessage()               {}
-func (*PodsMetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{11} }
+func (*PodsMetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{13} }
 
 func (m *ResourceMetricSource) Reset()                    { *m = ResourceMetricSource{} }
 func (*ResourceMetricSource) ProtoMessage()               {}
-func (*ResourceMetricSource) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{12} }
+func (*ResourceMetricSource) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{14} }
 
 func (m *ResourceMetricStatus) Reset()                    { *m = ResourceMetricStatus{} }
 func (*ResourceMetricStatus) ProtoMessage()               {}
-func (*ResourceMetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{13} }
+func (*ResourceMetricStatus) Descriptor() ([]byte, []int) { return fileDescriptorGenerated, []int{15} }
 
 func init() {
 	proto.RegisterType((*CrossVersionObjectReference)(nil), "k8s.io.api.autoscaling.v2beta1.CrossVersionObjectReference")
+	proto.RegisterType((*ExternalMetricSource)(nil), "k8s.io.api.autoscaling.v2beta1.ExternalMetricSource")
+	proto.RegisterType((*ExternalMetricStatus)(nil), "k8s.io.api.autoscaling.v2beta1.ExternalMetricStatus")
 	proto.RegisterType((*HorizontalPodAutoscaler)(nil), "k8s.io.api.autoscaling.v2beta1.HorizontalPodAutoscaler")
 	proto.RegisterType((*HorizontalPodAutoscalerCondition)(nil), "k8s.io.api.autoscaling.v2beta1.HorizontalPodAutoscalerCondition")
 	proto.RegisterType((*HorizontalPodAutoscalerList)(nil), "k8s.io.api.autoscaling.v2beta1.HorizontalPodAutoscalerList")
@@ -179,6 +191,108 @@ func (m *CrossVersionObjectReference) MarshalTo(dAtA []byte) (int, error) {
 	return i, nil
 }
 
+func (m *ExternalMetricSource) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalTo(dAtA)
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *ExternalMetricSource) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	dAtA[i] = 0xa
+	i++
+	i = encodeVarintGenerated(dAtA, i, uint64(len(m.MetricName)))
+	i += copy(dAtA[i:], m.MetricName)
+	if m.MetricSelector != nil {
+		dAtA[i] = 0x12
+		i++
+		i = encodeVarintGenerated(dAtA, i, uint64(m.MetricSelector.Size()))
+		n1, err := m.MetricSelector.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n1
+	}
+	if m.TargetValue != nil {
+		dAtA[i] = 0x1a
+		i++
+		i = encodeVarintGenerated(dAtA, i, uint64(m.TargetValue.Size()))
+		n2, err := m.TargetValue.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n2
+	}
+	if m.TargetAverageValue != nil {
+		dAtA[i] = 0x22
+		i++
+		i = encodeVarintGenerated(dAtA, i, uint64(m.TargetAverageValue.Size()))
+		n3, err := m.TargetAverageValue.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n3
+	}
+	return i, nil
+}
+
+func (m *ExternalMetricStatus) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalTo(dAtA)
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *ExternalMetricStatus) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	dAtA[i] = 0xa
+	i++
+	i = encodeVarintGenerated(dAtA, i, uint64(len(m.MetricName)))
+	i += copy(dAtA[i:], m.MetricName)
+	if m.MetricSelector != nil {
+		dAtA[i] = 0x12
+		i++
+		i = encodeVarintGenerated(dAtA, i, uint64(m.MetricSelector.Size()))
+		n4, err := m.MetricSelector.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n4
+	}
+	dAtA[i] = 0x1a
+	i++
+	i = encodeVarintGenerated(dAtA, i, uint64(m.CurrentValue.Size()))
+	n5, err := m.CurrentValue.MarshalTo(dAtA[i:])
+	if err != nil {
+		return 0, err
+	}
+	i += n5
+	if m.CurrentAverageValue != nil {
+		dAtA[i] = 0x22
+		i++
+		i = encodeVarintGenerated(dAtA, i, uint64(m.CurrentAverageValue.Size()))
+		n6, err := m.CurrentAverageValue.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n6
+	}
+	return i, nil
+}
+
 func (m *HorizontalPodAutoscaler) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
@@ -197,27 +311,27 @@ func (m *HorizontalPodAutoscaler) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.ObjectMeta.Size()))
-	n1, err := m.ObjectMeta.MarshalTo(dAtA[i:])
+	n7, err := m.ObjectMeta.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n1
+	i += n7
 	dAtA[i] = 0x12
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.Spec.Size()))
-	n2, err := m.Spec.MarshalTo(dAtA[i:])
+	n8, err := m.Spec.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n2
+	i += n8
 	dAtA[i] = 0x1a
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.Status.Size()))
-	n3, err := m.Status.MarshalTo(dAtA[i:])
+	n9, err := m.Status.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n3
+	i += n9
 	return i, nil
 }
 
@@ -247,11 +361,11 @@ func (m *HorizontalPodAutoscalerCondition) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0x1a
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.LastTransitionTime.Size()))
-	n4, err := m.LastTransitionTime.MarshalTo(dAtA[i:])
+	n10, err := m.LastTransitionTime.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n4
+	i += n10
 	dAtA[i] = 0x22
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(len(m.Reason)))
@@ -281,11 +395,11 @@ func (m *HorizontalPodAutoscalerList) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.ListMeta.Size()))
-	n5, err := m.ListMeta.MarshalTo(dAtA[i:])
+	n11, err := m.ListMeta.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n5
+	i += n11
 	if len(m.Items) > 0 {
 		for _, msg := range m.Items {
 			dAtA[i] = 0x12
@@ -319,11 +433,11 @@ func (m *HorizontalPodAutoscalerSpec) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.ScaleTargetRef.Size()))
-	n6, err := m.ScaleTargetRef.MarshalTo(dAtA[i:])
+	n12, err := m.ScaleTargetRef.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n6
+	i += n12
 	if m.MinReplicas != nil {
 		dAtA[i] = 0x10
 		i++
@@ -371,11 +485,11 @@ func (m *HorizontalPodAutoscalerStatus) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0x12
 		i++
 		i = encodeVarintGenerated(dAtA, i, uint64(m.LastScaleTime.Size()))
-		n7, err := m.LastScaleTime.MarshalTo(dAtA[i:])
+		n13, err := m.LastScaleTime.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n7
+		i += n13
 	}
 	dAtA[i] = 0x18
 	i++
@@ -433,31 +547,41 @@ func (m *MetricSpec) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0x12
 		i++
 		i = encodeVarintGenerated(dAtA, i, uint64(m.Object.Size()))
-		n8, err := m.Object.MarshalTo(dAtA[i:])
+		n14, err := m.Object.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n8
+		i += n14
 	}
 	if m.Pods != nil {
 		dAtA[i] = 0x1a
 		i++
 		i = encodeVarintGenerated(dAtA, i, uint64(m.Pods.Size()))
-		n9, err := m.Pods.MarshalTo(dAtA[i:])
+		n15, err := m.Pods.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n9
+		i += n15
 	}
 	if m.Resource != nil {
 		dAtA[i] = 0x22
 		i++
 		i = encodeVarintGenerated(dAtA, i, uint64(m.Resource.Size()))
-		n10, err := m.Resource.MarshalTo(dAtA[i:])
+		n16, err := m.Resource.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n10
+		i += n16
+	}
+	if m.External != nil {
+		dAtA[i] = 0x2a
+		i++
+		i = encodeVarintGenerated(dAtA, i, uint64(m.External.Size()))
+		n17, err := m.External.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n17
 	}
 	return i, nil
 }
@@ -485,31 +609,41 @@ func (m *MetricStatus) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0x12
 		i++
 		i = encodeVarintGenerated(dAtA, i, uint64(m.Object.Size()))
-		n11, err := m.Object.MarshalTo(dAtA[i:])
+		n18, err := m.Object.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n11
+		i += n18
 	}
 	if m.Pods != nil {
 		dAtA[i] = 0x1a
 		i++
 		i = encodeVarintGenerated(dAtA, i, uint64(m.Pods.Size()))
-		n12, err := m.Pods.MarshalTo(dAtA[i:])
+		n19, err := m.Pods.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n12
+		i += n19
 	}
 	if m.Resource != nil {
 		dAtA[i] = 0x22
 		i++
 		i = encodeVarintGenerated(dAtA, i, uint64(m.Resource.Size()))
-		n13, err := m.Resource.MarshalTo(dAtA[i:])
+		n20, err := m.Resource.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n13
+		i += n20
+	}
+	if m.External != nil {
+		dAtA[i] = 0x2a
+		i++
+		i = encodeVarintGenerated(dAtA, i, uint64(m.External.Size()))
+		n21, err := m.External.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n21
 	}
 	return i, nil
 }
@@ -532,11 +666,11 @@ func (m *ObjectMetricSource) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.Target.Size()))
-	n14, err := m.Target.MarshalTo(dAtA[i:])
+	n22, err := m.Target.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n14
+	i += n22
 	dAtA[i] = 0x12
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(len(m.MetricName)))
@@ -544,11 +678,11 @@ func (m *ObjectMetricSource) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0x1a
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.TargetValue.Size()))
-	n15, err := m.TargetValue.MarshalTo(dAtA[i:])
+	n23, err := m.TargetValue.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n15
+	i += n23
 	return i, nil
 }
 
@@ -570,11 +704,11 @@ func (m *ObjectMetricStatus) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.Target.Size()))
-	n16, err := m.Target.MarshalTo(dAtA[i:])
+	n24, err := m.Target.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n16
+	i += n24
 	dAtA[i] = 0x12
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(len(m.MetricName)))
@@ -582,11 +716,11 @@ func (m *ObjectMetricStatus) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0x1a
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.CurrentValue.Size()))
-	n17, err := m.CurrentValue.MarshalTo(dAtA[i:])
+	n25, err := m.CurrentValue.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n17
+	i += n25
 	return i, nil
 }
 
@@ -612,11 +746,11 @@ func (m *PodsMetricSource) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0x12
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.TargetAverageValue.Size()))
-	n18, err := m.TargetAverageValue.MarshalTo(dAtA[i:])
+	n26, err := m.TargetAverageValue.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n18
+	i += n26
 	return i, nil
 }
 
@@ -642,11 +776,11 @@ func (m *PodsMetricStatus) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0x12
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.CurrentAverageValue.Size()))
-	n19, err := m.CurrentAverageValue.MarshalTo(dAtA[i:])
+	n27, err := m.CurrentAverageValue.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n19
+	i += n27
 	return i, nil
 }
 
@@ -678,11 +812,11 @@ func (m *ResourceMetricSource) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0x1a
 		i++
 		i = encodeVarintGenerated(dAtA, i, uint64(m.TargetAverageValue.Size()))
-		n20, err := m.TargetAverageValue.MarshalTo(dAtA[i:])
+		n28, err := m.TargetAverageValue.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n20
+		i += n28
 	}
 	return i, nil
 }
@@ -714,11 +848,11 @@ func (m *ResourceMetricStatus) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0x1a
 	i++
 	i = encodeVarintGenerated(dAtA, i, uint64(m.CurrentAverageValue.Size()))
-	n21, err := m.CurrentAverageValue.MarshalTo(dAtA[i:])
+	n29, err := m.CurrentAverageValue.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n21
+	i += n29
 	return i, nil
 }
 
@@ -761,6 +895,44 @@ func (m *CrossVersionObjectReference) Size() (n int) {
 	return n
 }
 
+func (m *ExternalMetricSource) Size() (n int) {
+	var l int
+	_ = l
+	l = len(m.MetricName)
+	n += 1 + l + sovGenerated(uint64(l))
+	if m.MetricSelector != nil {
+		l = m.MetricSelector.Size()
+		n += 1 + l + sovGenerated(uint64(l))
+	}
+	if m.TargetValue != nil {
+		l = m.TargetValue.Size()
+		n += 1 + l + sovGenerated(uint64(l))
+	}
+	if m.TargetAverageValue != nil {
+		l = m.TargetAverageValue.Size()
+		n += 1 + l + sovGenerated(uint64(l))
+	}
+	return n
+}
+
+func (m *ExternalMetricStatus) Size() (n int) {
+	var l int
+	_ = l
+	l = len(m.MetricName)
+	n += 1 + l + sovGenerated(uint64(l))
+	if m.MetricSelector != nil {
+		l = m.MetricSelector.Size()
+		n += 1 + l + sovGenerated(uint64(l))
+	}
+	l = m.CurrentValue.Size()
+	n += 1 + l + sovGenerated(uint64(l))
+	if m.CurrentAverageValue != nil {
+		l = m.CurrentAverageValue.Size()
+		n += 1 + l + sovGenerated(uint64(l))
+	}
+	return n
+}
+
 func (m *HorizontalPodAutoscaler) Size() (n int) {
 	var l int
 	_ = l
@@ -865,6 +1037,10 @@ func (m *MetricSpec) Size() (n int) {
 		l = m.Resource.Size()
 		n += 1 + l + sovGenerated(uint64(l))
 	}
+	if m.External != nil {
+		l = m.External.Size()
+		n += 1 + l + sovGenerated(uint64(l))
+	}
 	return n
 }
 
@@ -885,6 +1061,10 @@ func (m *MetricStatus) Size() (n int) {
 		l = m.Resource.Size()
 		n += 1 + l + sovGenerated(uint64(l))
 	}
+	if m.External != nil {
+		l = m.External.Size()
+		n += 1 + l + sovGenerated(uint64(l))
+	}
 	return n
 }
 
@@ -985,6 +1165,32 @@ func (this *CrossVersionObjectReference) String() string {
 	}, "")
 	return s
 }
+func (this *ExternalMetricSource) String() string {
+	if this == nil {
+		return "nil"
+	}
+	s := strings.Join([]string{`&ExternalMetricSource{`,
+		`MetricName:` + fmt.Sprintf("%v", this.MetricName) + `,`,
+		`MetricSelector:` + strings.Replace(fmt.Sprintf("%v", this.MetricSelector), "LabelSelector", "k8s_io_apimachinery_pkg_apis_meta_v1.LabelSelector", 1) + `,`,
+		`TargetValue:` + strings.Replace(fmt.Sprintf("%v", this.TargetValue), "Quantity", "k8s_io_apimachinery_pkg_api_resource.Quantity", 1) + `,`,
+		`TargetAverageValue:` + strings.Replace(fmt.Sprintf("%v", this.TargetAverageValue), "Quantity", "k8s_io_apimachinery_pkg_api_resource.Quantity", 1) + `,`,
+		`}`,
+	}, "")
+	return s
+}
+func (this *ExternalMetricStatus) String() string {
+	if this == nil {
+		return "nil"
+	}
+	s := strings.Join([]string{`&ExternalMetricStatus{`,
+		`MetricName:` + fmt.Sprintf("%v", this.MetricName) + `,`,
+		`MetricSelector:` + strings.Replace(fmt.Sprintf("%v", this.MetricSelector), "LabelSelector", "k8s_io_apimachinery_pkg_apis_meta_v1.LabelSelector", 1) + `,`,
+		`CurrentValue:` + strings.Replace(strings.Replace(this.CurrentValue.String(), "Quantity", "k8s_io_apimachinery_pkg_api_resource.Quantity", 1), `&`, ``, 1) + `,`,
+		`CurrentAverageValue:` + strings.Replace(fmt.Sprintf("%v", this.CurrentAverageValue), "Quantity", "k8s_io_apimachinery_pkg_api_resource.Quantity", 1) + `,`,
+		`}`,
+	}, "")
+	return s
+}
 func (this *HorizontalPodAutoscaler) String() string {
 	if this == nil {
 		return "nil"
@@ -1059,6 +1265,7 @@ func (this *MetricSpec) String() string {
 		`Object:` + strings.Replace(fmt.Sprintf("%v", this.Object), "ObjectMetricSource", "ObjectMetricSource", 1) + `,`,
 		`Pods:` + strings.Replace(fmt.Sprintf("%v", this.Pods), "PodsMetricSource", "PodsMetricSource", 1) + `,`,
 		`Resource:` + strings.Replace(fmt.Sprintf("%v", this.Resource), "ResourceMetricSource", "ResourceMetricSource", 1) + `,`,
+		`External:` + strings.Replace(fmt.Sprintf("%v", this.External), "ExternalMetricSource", "ExternalMetricSource", 1) + `,`,
 		`}`,
 	}, "")
 	return s
@@ -1072,6 +1279,7 @@ func (this *MetricStatus) String() string {
 		`Object:` + strings.Replace(fmt.Sprintf("%v", this.Object), "ObjectMetricStatus", "ObjectMetricStatus", 1) + `,`,
 		`Pods:` + strings.Replace(fmt.Sprintf("%v", this.Pods), "PodsMetricStatus", "PodsMetricStatus", 1) + `,`,
 		`Resource:` + strings.Replace(fmt.Sprintf("%v", this.Resource), "ResourceMetricStatus", "ResourceMetricStatus", 1) + `,`,
+		`External:` + strings.Replace(fmt.Sprintf("%v", this.External), "ExternalMetricStatus", "ExternalMetricStatus", 1) + `,`,
 		`}`,
 	}, "")
 	return s
@@ -1291,6 +1499,359 @@ func (m *CrossVersionObjectReference) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *ExternalMetricSource) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowGenerated
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: ExternalMetricSource: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: ExternalMetricSource: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field MetricName", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.MetricName = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field MetricSelector", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.MetricSelector == nil {
+				m.MetricSelector = &k8s_io_apimachinery_pkg_apis_meta_v1.LabelSelector{}
+			}
+			if err := m.MetricSelector.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		case 3:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field TargetValue", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.TargetValue == nil {
+				m.TargetValue = &k8s_io_apimachinery_pkg_api_resource.Quantity{}
+			}
+			if err := m.TargetValue.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		case 4:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field TargetAverageValue", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.TargetAverageValue == nil {
+				m.TargetAverageValue = &k8s_io_apimachinery_pkg_api_resource.Quantity{}
+			}
+			if err := m.TargetAverageValue.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipGenerated(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *ExternalMetricStatus) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowGenerated
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: ExternalMetricStatus: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: ExternalMetricStatus: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field MetricName", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.MetricName = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field MetricSelector", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.MetricSelector == nil {
+				m.MetricSelector = &k8s_io_apimachinery_pkg_apis_meta_v1.LabelSelector{}
+			}
+			if err := m.MetricSelector.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		case 3:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field CurrentValue", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if err := m.CurrentValue.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		case 4:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field CurrentAverageValue", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.CurrentAverageValue == nil {
+				m.CurrentAverageValue = &k8s_io_apimachinery_pkg_api_resource.Quantity{}
+			}
+			if err := m.CurrentAverageValue.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipGenerated(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func (m *HorizontalPodAutoscaler) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0
@@ -2248,6 +2809,39 @@ func (m *MetricSpec) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 5:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field External", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.External == nil {
+				m.External = &ExternalMetricSource{}
+			}
+			if err := m.External.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipGenerated(dAtA[iNdEx:])
@@ -2426,6 +3020,39 @@ func (m *MetricStatus) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 5:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field External", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGenerated
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGenerated
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.External == nil {
+				m.External = &ExternalMetricStatus{}
+			}
+			if err := m.External.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipGenerated(dAtA[iNdEx:])
@@ -3314,88 +3941,96 @@ func init() {
 }
 
 var fileDescriptorGenerated = []byte{
-	// 1316 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xcc, 0x57, 0xcd, 0x6f, 0x1b, 0x45,
-	0x14, 0x8f, 0x1d, 0x27, 0x0d, 0xe3, 0x34, 0x29, 0xd3, 0xaa, 0x75, 0x53, 0x6a, 0x47, 0x2b, 0x84,
-	0x4a, 0x45, 0x77, 0x5b, 0x13, 0x3e, 0x24, 0x84, 0x44, 0x6c, 0x44, 0x5b, 0x91, 0xb4, 0x65, 0x9a,
-	0x56, 0x08, 0x0a, 0x62, 0xb2, 0x3b, 0x75, 0x86, 0x78, 0x3f, 0x34, 0x33, 0xb6, 0x48, 0x11, 0x12,
-	0x17, 0xee, 0x1c, 0x40, 0xfc, 0x15, 0x5c, 0xe1, 0x0c, 0x12, 0x52, 0x85, 0x38, 0xf4, 0x58, 0x84,
-	0x64, 0x51, 0xf3, 0x5f, 0xf4, 0x84, 0xe6, 0xc3, 0xfb, 0x61, 0x7b, 0xe3, 0xc4, 0x44, 0xc0, 0xcd,
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+	0xc1, 0x1e, 0x8a, 0x50, 0xe1, 0xfb, 0x20, 0xcf, 0x3b, 0xc4, 0xd6, 0x91, 0x7c, 0xc5, 0xdc, 0xbf,
+	0xba, 0x9b, 0x29, 0x86, 0x6e, 0x75, 0x88, 0x3d, 0x28, 0x26, 0xc1, 0x0a, 0x49, 0x58, 0x48, 0xc0,
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+	0x6b, 0xa4, 0xc1, 0x8d, 0xcf, 0x72, 0x60, 0x2d, 0x45, 0xb2, 0xe6, 0xb9, 0x4d, 0x2a, 0xa8, 0xe7,
+	0xc2, 0x2b, 0x20, 0x2f, 0xf6, 0x3a, 0x61, 0xb2, 0xaf, 0x87, 0xd6, 0x6e, 0xef, 0x75, 0xc8, 0xe3,
+	0x7e, 0xf9, 0x7f, 0x93, 0xe4, 0x03, 0x3e, 0x24, 0x11, 0xe0, 0x66, 0x74, 0xaa, 0x6c, 0x02, 0x4b,
+	0x9b, 0xf5, 0xb8, 0x5f, 0x1e, 0xf3, 0xac, 0x99, 0x11, 0x52, 0xd2, 0xf8, 0xa0, 0x36, 0xb4, 0x31,
+	0x17, 0xdb, 0x0c, 0xbb, 0x5c, 0x69, 0xa2, 0x4e, 0x98, 0xeb, 0xe7, 0xa6, 0x0b, 0x77, 0x20, 0x51,
+	0x5d, 0xd5, 0x56, 0xc0, 0xcd, 0x11, 0x34, 0x34, 0x46, 0x03, 0xfc, 0x3f, 0x58, 0x60, 0x04, 0x73,
+	0xcf, 0x95, 0x69, 0x7e, 0x78, 0xe0, 0x5c, 0x24, 0x77, 0x91, 0xa6, 0xc2, 0xe7, 0xc0, 0x21, 0x87,
+	0x70, 0x8e, 0x5b, 0xa4, 0x38, 0x2f, 0x19, 0x57, 0x34, 0xe3, 0xa1, 0xba, 0xda, 0x46, 0x21, 0xdd,
+	0xf8, 0x35, 0x03, 0x4e, 0xa7, 0xf8, 0x71, 0x93, 0x72, 0x01, 0x6f, 0x8f, 0xe4, 0xb3, 0x39, 0x65,
+	0xed, 0xa0, 0x5c, 0x65, 0xf3, 0x51, 0xad, 0x7b, 0x31, 0xdc, 0x89, 0xe5, 0xf2, 0x6d, 0x30, 0x4f,
+	0x05, 0x71, 0x82, 0xa8, 0xe4, 0xce, 0x16, 0x2a, 0x2f, 0xcd, 0x98, 0x6b, 0xd5, 0x23, 0x5a, 0xc7,
+	0xfc, 0xd5, 0x00, 0x0d, 0x29, 0x50, 0xe3, 0xb7, 0x6c, 0xea, 0xd9, 0x82, 0x84, 0x87, 0x1f, 0x83,
+	0x65, 0xb9, 0x52, 0x95, 0x19, 0x91, 0x3b, 0xfa, 0x84, 0x13, 0xef, 0xd4, 0x3e, 0x0f, 0x7a, 0xf5,
+	0x84, 0x36, 0x65, 0x79, 0x2b, 0x01, 0x8d, 0x86, 0x54, 0xc1, 0x8b, 0xa0, 0xe0, 0x50, 0x17, 0x91,
+	0x4e, 0x9b, 0xda, 0x58, 0xa5, 0xe5, 0xbc, 0x7a, 0x92, 0xea, 0x83, 0x6d, 0x14, 0xe7, 0x81, 0x2f,
+	0x80, 0x82, 0x83, 0xef, 0x46, 0x22, 0x39, 0x29, 0x72, 0x4c, 0xeb, 0x2b, 0xd4, 0x07, 0x24, 0x14,
+	0xe7, 0x83, 0x37, 0x83, 0x6c, 0x08, 0xaa, 0x34, 0x2f, 0xe6, 0xa5, 0x9b, 0xcf, 0x4d, 0x3a, 0x9f,
+	0x2e, 0xf2, 0x41, 0x89, 0x88, 0x65, 0x8e, 0x84, 0x40, 0x21, 0x96, 0xf1, 0x43, 0x1e, 0x9c, 0xd9,
+	0xf7, 0xee, 0xc3, 0x37, 0x01, 0xf4, 0x1a, 0x9c, 0xb0, 0x1e, 0x69, 0x5e, 0x56, 0x6d, 0x51, 0xd0,
+	0x9f, 0x04, 0x3e, 0xce, 0xa9, 0x27, 0xf1, 0xfa, 0x08, 0x15, 0x8d, 0x91, 0x80, 0x36, 0x38, 0x12,
+	0x5c, 0x06, 0xe5, 0x50, 0xaa, 0x5b, 0xa1, 0x27, 0xbb, 0x69, 0xff, 0xf1, 0xfb, 0xe5, 0x23, 0x9b,
+	0x71, 0x10, 0x94, 0xc4, 0x84, 0x1b, 0x60, 0x45, 0xd7, 0xfa, 0x21, 0x07, 0x9f, 0xd4, 0x1e, 0x58,
+	0xa9, 0x25, 0xc9, 0x68, 0x98, 0x3f, 0x80, 0x68, 0x12, 0x4e, 0x19, 0x69, 0x46, 0x10, 0xf9, 0x24,
+	0xc4, 0xeb, 0x49, 0x32, 0x1a, 0xe6, 0x87, 0x6d, 0xb0, 0xac, 0x51, 0xb5, 0xbf, 0x8b, 0xf3, 0x32,
+	0x64, 0xcf, 0x4f, 0x19, 0x32, 0x55, 0x74, 0xa3, 0x1c, 0xac, 0x25, 0xb0, 0xd0, 0x10, 0x36, 0x14,
+	0x00, 0xd8, 0x61, 0x89, 0xe3, 0xc5, 0x05, 0xa9, 0xe9, 0xb5, 0x19, 0xef, 0x60, 0x54, 0x2b, 0x07,
+	0xcf, 0x57, 0xb4, 0xc5, 0x51, 0x4c, 0x8f, 0xf1, 0x6d, 0x0e, 0x80, 0x41, 0x86, 0xc1, 0xf5, 0x44,
+	0x91, 0x5f, 0x1b, 0x2a, 0xf2, 0x47, 0xe3, 0xcd, 0x69, 0xac, 0xa0, 0xdf, 0x02, 0x0b, 0x9e, 0xbc,
+	0x79, 0x3a, 0x19, 0x2a, 0x93, 0xcc, 0x8e, 0xde, 0xd2, 0x08, 0xad, 0x0a, 0x82, 0xd2, 0xa9, 0xef,
+	0xaf, 0x46, 0x83, 0xd7, 0x40, 0xbe, 0xe3, 0x35, 0xc3, 0xc7, 0xef, 0xc2, 0x24, 0xd4, 0x1b, 0x5e,
+	0x93, 0x27, 0x30, 0x17, 0x03, 0xdb, 0x83, 0x5d, 0x24, 0x71, 0xe0, 0x07, 0x60, 0x31, 0x6c, 0x37,
+	0x74, 0x6f, 0xb2, 0x3e, 0x09, 0x13, 0x69, 0xfe, 0x04, 0xee, 0x52, 0x50, 0x41, 0x43, 0x0a, 0x8a,
+	0x30, 0x03, 0x7c, 0xa2, 0xbb, 0x45, 0x59, 0xeb, 0xa7, 0xc0, 0x1f, 0xd7, 0xf6, 0x2b, 0xfc, 0x90,
+	0x82, 0x22, 0x4c, 0xe3, 0xbb, 0x1c, 0x58, 0x4a, 0xb4, 0xa1, 0x7f, 0x47, 0xb8, 0x54, 0x56, 0x1f,
+	0x6c, 0xb8, 0x14, 0xe6, 0xc1, 0x87, 0x4b, 0xe1, 0x3e, 0xbd, 0x70, 0xc5, 0xf0, 0xc7, 0x84, 0xeb,
+	0x8b, 0x2c, 0x80, 0xa3, 0x99, 0x0e, 0x6d, 0xb0, 0xa0, 0x46, 0x8d, 0x83, 0x78, 0xe1, 0xa2, 0xae,
+	0x43, 0x3f, 0x66, 0x1a, 0x7a, 0x68, 0x40, 0xc9, 0x4e, 0x35, 0xa0, 0x90, 0x83, 0x18, 0xe4, 0xa2,
+	0x27, 0x30, 0x6d, 0x98, 0x33, 0xbe, 0x1e, 0x76, 0x8b, 0xca, 0xe5, 0x7f, 0xac, 0x5b, 0x9e, 0xd9,
+	0x18, 0x65, 0xfc, 0x9c, 0x01, 0x47, 0x87, 0x8b, 0xd8, 0x4c, 0xa3, 0xe6, 0xbd, 0xb1, 0xf3, 0x72,
+	0x76, 0x26, 0xc3, 0xa3, 0xbe, 0x78, 0xca, 0x99, 0xf9, 0x97, 0xe4, 0x21, 0x66, 0x9f, 0x97, 0x3f,
+	0x19, 0x3f, 0x54, 0xce, 0x76, 0x8a, 0xd3, 0x5a, 0xd9, 0xf4, 0x83, 0xe5, 0xf7, 0x59, 0x70, 0x7c,
+	0x5c, 0xf5, 0x87, 0x35, 0xfd, 0x0f, 0x48, 0x9d, 0xc2, 0x8a, 0xff, 0x03, 0x7a, 0xdc, 0x2f, 0x97,
+	0xc7, 0x8c, 0x2e, 0x21, 0x4c, 0xec, 0x37, 0xd1, 0x3b, 0xa0, 0x98, 0xf0, 0xdd, 0x4d, 0x41, 0xdb,
+	0xf4, 0x9e, 0x6a, 0xca, 0x54, 0xfb, 0xf9, 0x5f, 0xbf, 0x5f, 0x2e, 0x6e, 0xa7, 0xf0, 0xa0, 0x54,
+	0xe9, 0x94, 0x7f, 0x25, 0xb9, 0xa7, 0xfe, 0xaf, 0xe4, 0xc7, 0x51, 0x7f, 0xa9, 0xd8, 0x1f, 0x88,
+	0xbf, 0xde, 0x03, 0xa7, 0x92, 0x41, 0x1a, 0x75, 0xd8, 0x19, 0xbf, 0x5f, 0x3e, 0x55, 0x4b, 0x63,
+	0x42, 0xe9, 0xf2, 0x69, 0x99, 0x96, 0x7b, 0x36, 0x99, 0x56, 0x3d, 0x7f, 0xff, 0x51, 0x69, 0xee,
+	0xc1, 0xa3, 0xd2, 0xdc, 0xc3, 0x47, 0xa5, 0xb9, 0x4f, 0xfd, 0x52, 0xe6, 0xbe, 0x5f, 0xca, 0x3c,
+	0xf0, 0x4b, 0x99, 0x87, 0x7e, 0x29, 0xf3, 0xbb, 0x5f, 0xca, 0x7c, 0xfe, 0x47, 0x69, 0xee, 0xdd,
+	0x43, 0xba, 0xee, 0xfd, 0x19, 0x00, 0x00, 0xff, 0xff, 0x91, 0x09, 0xa9, 0x38, 0x8c, 0x16, 0x00,
+	0x00,
 }
diff --git a/staging/src/k8s.io/api/autoscaling/v2beta1/generated.proto b/staging/src/k8s.io/api/autoscaling/v2beta1/generated.proto
index 0c682b35ea2..b565920c31b 100644
--- a/staging/src/k8s.io/api/autoscaling/v2beta1/generated.proto
+++ b/staging/src/k8s.io/api/autoscaling/v2beta1/generated.proto
@@ -44,6 +44,50 @@ message CrossVersionObjectReference {
   optional string apiVersion = 3;
 }
 
+// ExternalMetricSource indicates how to scale on a metric not associated with
+// any Kubernetes object (for example length of queue in cloud
+// messaging service, or QPS from loadbalancer running outside of cluster).
+// Exactly one "target" type should be set.
+message ExternalMetricSource {
+  // metricName is the name of the metric in question.
+  optional string metricName = 1;
+
+  // metricSelector is used to identify a specific time series
+  // within a given metric.
+  // +optional
+  optional k8s.io.apimachinery.pkg.apis.meta.v1.LabelSelector metricSelector = 2;
+
+  // targetValue is the target value of the metric (as a quantity).
+  // Mutually exclusive with TargetAverageValue.
+  // +optional
+  optional k8s.io.apimachinery.pkg.api.resource.Quantity targetValue = 3;
+
+  // targetAverageValue is the target per-pod value of global metric (as a quantity).
+  // Mutually exclusive with TargetValue.
+  // +optional
+  optional k8s.io.apimachinery.pkg.api.resource.Quantity targetAverageValue = 4;
+}
+
+// ExternalMetricStatus indicates the current value of a global metric
+// not associated with any Kubernetes object.
+message ExternalMetricStatus {
+  // metricName is the name of a metric used for autoscaling in
+  // metric system.
+  optional string metricName = 1;
+
+  // metricSelector is used to identify a specific time series
+  // within a given metric.
+  // +optional
+  optional k8s.io.apimachinery.pkg.apis.meta.v1.LabelSelector metricSelector = 2;
+
+  // currentValue is the current value of the metric (as a quantity)
+  optional k8s.io.apimachinery.pkg.api.resource.Quantity currentValue = 3;
+
+  // currentAverageValue is the current value of metric averaged over autoscaled pods.
+  // +optional
+  optional k8s.io.apimachinery.pkg.api.resource.Quantity currentAverageValue = 4;
+}
+
 // HorizontalPodAutoscaler is the configuration for a horizontal pod
 // autoscaler, which automatically manages the replica count of any resource
 // implementing the scale subresource based on the metrics specified.
@@ -175,6 +219,14 @@ message MetricSpec {
   // to normal per-pod metrics using the "pods" source.
   // +optional
   optional ResourceMetricSource resource = 4;
+
+  // external refers to a global metric that is not associated
+  // with any Kubernetes object. It allows autoscaling based on information
+  // coming from components running outside of cluster
+  // (for example length of queue in cloud messaging service, or
+  // QPS from loadbalancer running outside of cluster).
+  // +optional
+  optional ExternalMetricSource external = 5;
 }
 
 // MetricStatus describes the last-read state of a single metric.
@@ -201,6 +253,14 @@ message MetricStatus {
   // to normal per-pod metrics using the "pods" source.
   // +optional
   optional ResourceMetricStatus resource = 4;
+
+  // external refers to a global metric that is not associated
+  // with any Kubernetes object. It allows autoscaling based on information
+  // coming from components running outside of cluster
+  // (for example length of queue in cloud messaging service, or
+  // QPS from loadbalancer running outside of cluster).
+  // +optional
+  optional ExternalMetricStatus external = 5;
 }
 
 // ObjectMetricSource indicates how to scale on a metric describing a
diff --git a/staging/src/k8s.io/api/autoscaling/v2beta1/types_swagger_doc_generated.go b/staging/src/k8s.io/api/autoscaling/v2beta1/types_swagger_doc_generated.go
index 8bcf0f4b305..12cfa764937 100644
--- a/staging/src/k8s.io/api/autoscaling/v2beta1/types_swagger_doc_generated.go
+++ b/staging/src/k8s.io/api/autoscaling/v2beta1/types_swagger_doc_generated.go
@@ -38,6 +38,30 @@ func (CrossVersionObjectReference) SwaggerDoc() map[string]string {
 	return map_CrossVersionObjectReference
 }
 
+var map_ExternalMetricSource = map[string]string{
+	"":                   "ExternalMetricSource indicates how to scale on a metric not associated with any Kubernetes object (for example length of queue in cloud messaging service, or QPS from loadbalancer running outside of cluster). Exactly one \"target\" type should be set.",
+	"metricName":         "metricName is the name of the metric in question.",
+	"metricSelector":     "metricSelector is used to identify a specific time series within a given metric.",
+	"targetValue":        "targetValue is the target value of the metric (as a quantity). Mutually exclusive with TargetAverageValue.",
+	"targetAverageValue": "targetAverageValue is the target per-pod value of global metric (as a quantity). Mutually exclusive with TargetValue.",
+}
+
+func (ExternalMetricSource) SwaggerDoc() map[string]string {
+	return map_ExternalMetricSource
+}
+
+var map_ExternalMetricStatus = map[string]string{
+	"":                    "ExternalMetricStatus indicates the current value of a global metric not associated with any Kubernetes object.",
+	"metricName":          "metricName is the name of a metric used for autoscaling in metric system.",
+	"metricSelector":      "metricSelector is used to identify a specific time series within a given metric.",
+	"currentValue":        "currentValue is the current value of the metric (as a quantity)",
+	"currentAverageValue": "currentAverageValue is the current value of metric averaged over autoscaled pods.",
+}
+
+func (ExternalMetricStatus) SwaggerDoc() map[string]string {
+	return map_ExternalMetricStatus
+}
+
 var map_HorizontalPodAutoscaler = map[string]string{
 	"":         "HorizontalPodAutoscaler is the configuration for a horizontal pod autoscaler, which automatically manages the replica count of any resource implementing the scale subresource based on the metrics specified.",
 	"metadata": "metadata is the standard object metadata. More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#metadata",
@@ -104,6 +128,7 @@ var map_MetricSpec = map[string]string{
 	"object":   "object refers to a metric describing a single kubernetes object (for example, hits-per-second on an Ingress object).",
 	"pods":     "pods refers to a metric describing each pod in the current scale target (for example, transactions-processed-per-second).  The values will be averaged together before being compared to the target value.",
 	"resource": "resource refers to a resource metric (such as those specified in requests and limits) known to Kubernetes describing each pod in the current scale target (e.g. CPU or memory). Such metrics are built in to Kubernetes, and have special scaling options on top of those available to normal per-pod metrics using the \"pods\" source.",
+	"external": "external refers to a global metric that is not associated with any Kubernetes object. It allows autoscaling based on information coming from components running outside of cluster (for example length of queue in cloud messaging service, or QPS from loadbalancer running outside of cluster).",
 }
 
 func (MetricSpec) SwaggerDoc() map[string]string {
@@ -116,6 +141,7 @@ var map_MetricStatus = map[string]string{
 	"object":   "object refers to a metric describing a single kubernetes object (for example, hits-per-second on an Ingress object).",
 	"pods":     "pods refers to a metric describing each pod in the current scale target (for example, transactions-processed-per-second).  The values will be averaged together before being compared to the target value.",
 	"resource": "resource refers to a resource metric (such as those specified in requests and limits) known to Kubernetes describing each pod in the current scale target (e.g. CPU or memory). Such metrics are built in to Kubernetes, and have special scaling options on top of those available to normal per-pod metrics using the \"pods\" source.",
+	"external": "external refers to a global metric that is not associated with any Kubernetes object. It allows autoscaling based on information coming from components running outside of cluster (for example length of queue in cloud messaging service, or QPS from loadbalancer running outside of cluster).",
 }
 
 func (MetricStatus) SwaggerDoc() map[string]string {
diff --git a/staging/src/k8s.io/api/autoscaling/v2beta1/zz_generated.deepcopy.go b/staging/src/k8s.io/api/autoscaling/v2beta1/zz_generated.deepcopy.go
index 70bec2b5b6c..0f5472461af 100644
--- a/staging/src/k8s.io/api/autoscaling/v2beta1/zz_generated.deepcopy.go
+++ b/staging/src/k8s.io/api/autoscaling/v2beta1/zz_generated.deepcopy.go
@@ -42,6 +42,84 @@ func (in *CrossVersionObjectReference) DeepCopy() *CrossVersionObjectReference {
 	return out
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *ExternalMetricSource) DeepCopyInto(out *ExternalMetricSource) {
+	*out = *in
+	if in.MetricSelector != nil {
+		in, out := &in.MetricSelector, &out.MetricSelector
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(v1.LabelSelector)
+			(*in).DeepCopyInto(*out)
+		}
+	}
+	if in.TargetValue != nil {
+		in, out := &in.TargetValue, &out.TargetValue
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(resource.Quantity)
+			**out = (*in).DeepCopy()
+		}
+	}
+	if in.TargetAverageValue != nil {
+		in, out := &in.TargetAverageValue, &out.TargetAverageValue
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(resource.Quantity)
+			**out = (*in).DeepCopy()
+		}
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new ExternalMetricSource.
+func (in *ExternalMetricSource) DeepCopy() *ExternalMetricSource {
+	if in == nil {
+		return nil
+	}
+	out := new(ExternalMetricSource)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *ExternalMetricStatus) DeepCopyInto(out *ExternalMetricStatus) {
+	*out = *in
+	if in.MetricSelector != nil {
+		in, out := &in.MetricSelector, &out.MetricSelector
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(v1.LabelSelector)
+			(*in).DeepCopyInto(*out)
+		}
+	}
+	out.CurrentValue = in.CurrentValue.DeepCopy()
+	if in.CurrentAverageValue != nil {
+		in, out := &in.CurrentAverageValue, &out.CurrentAverageValue
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(resource.Quantity)
+			**out = (*in).DeepCopy()
+		}
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new ExternalMetricStatus.
+func (in *ExternalMetricStatus) DeepCopy() *ExternalMetricStatus {
+	if in == nil {
+		return nil
+	}
+	out := new(ExternalMetricStatus)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *HorizontalPodAutoscaler) DeepCopyInto(out *HorizontalPodAutoscaler) {
 	*out = *in
@@ -233,6 +311,15 @@ func (in *MetricSpec) DeepCopyInto(out *MetricSpec) {
 			(*in).DeepCopyInto(*out)
 		}
 	}
+	if in.External != nil {
+		in, out := &in.External, &out.External
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(ExternalMetricSource)
+			(*in).DeepCopyInto(*out)
+		}
+	}
 	return
 }
 
@@ -276,6 +363,15 @@ func (in *MetricStatus) DeepCopyInto(out *MetricStatus) {
 			(*in).DeepCopyInto(*out)
 		}
 	}
+	if in.External != nil {
+		in, out := &in.External, &out.External
+		if *in == nil {
+			*out = nil
+		} else {
+			*out = new(ExternalMetricStatus)
+			(*in).DeepCopyInto(*out)
+		}
+	}
 	return
 }
 

From 602aaaf03da39531a98e4c83d48c2c19570bd5d2 Mon Sep 17 00:00:00 2001
From: Maciej Pytel <maciekpytel@google.com>
Date: Wed, 21 Feb 2018 11:47:52 +0100
Subject: [PATCH 3/3] Validation for HPA external metrics

---
 pkg/apis/autoscaling/validation/validation.go |  35 +++-
 .../autoscaling/validation/validation_test.go | 180 ++++++++++++++++++
 2 files changed, 214 insertions(+), 1 deletion(-)

diff --git a/pkg/apis/autoscaling/validation/validation.go b/pkg/apis/autoscaling/validation/validation.go
index 6338b2a744e..a8e789cf8a3 100644
--- a/pkg/apis/autoscaling/validation/validation.go
+++ b/pkg/apis/autoscaling/validation/validation.go
@@ -115,7 +115,7 @@ func validateMetrics(metrics []autoscaling.MetricSpec, fldPath *field.Path) fiel
 	return allErrs
 }
 
-var validMetricSourceTypes = sets.NewString(string(autoscaling.ObjectMetricSourceType), string(autoscaling.PodsMetricSourceType), string(autoscaling.ResourceMetricSourceType))
+var validMetricSourceTypes = sets.NewString(string(autoscaling.ObjectMetricSourceType), string(autoscaling.PodsMetricSourceType), string(autoscaling.ResourceMetricSourceType), string(autoscaling.ExternalMetricSourceType))
 var validMetricSourceTypesList = validMetricSourceTypes.List()
 
 func validateMetricSpec(spec autoscaling.MetricSpec, fldPath *field.Path) field.ErrorList {
@@ -137,6 +137,13 @@ func validateMetricSpec(spec autoscaling.MetricSpec, fldPath *field.Path) field.
 		}
 	}
 
+	if spec.External != nil {
+		typesPresent.Insert("external")
+		if typesPresent.Len() == 1 {
+			allErrs = append(allErrs, validateExternalSource(spec.External, fldPath.Child("external"))...)
+		}
+	}
+
 	if spec.Pods != nil {
 		typesPresent.Insert("pods")
 		if typesPresent.Len() == 1 {
@@ -183,6 +190,32 @@ func validateObjectSource(src *autoscaling.ObjectMetricSource, fldPath *field.Pa
 	return allErrs
 }
 
+func validateExternalSource(src *autoscaling.ExternalMetricSource, fldPath *field.Path) field.ErrorList {
+	allErrs := field.ErrorList{}
+
+	if len(src.MetricName) == 0 {
+		allErrs = append(allErrs, field.Required(fldPath.Child("metricName"), "must specify a metric name"))
+	}
+
+	if src.TargetValue == nil && src.TargetAverageValue == nil {
+		allErrs = append(allErrs, field.Required(fldPath.Child("targetValue"), "must set either a target value for metric or a per-pod target"))
+	}
+
+	if src.TargetValue != nil && src.TargetAverageValue != nil {
+		allErrs = append(allErrs, field.Forbidden(fldPath.Child("targetValue"), "may not set both a target value for metric and a per-pod target"))
+	}
+
+	if src.TargetAverageValue != nil && src.TargetAverageValue.Sign() != 1 {
+		allErrs = append(allErrs, field.Invalid(fldPath.Child("targetAverageValue"), src.TargetAverageValue, "must be positive"))
+	}
+
+	if src.TargetValue != nil && src.TargetValue.Sign() != 1 {
+		allErrs = append(allErrs, field.Invalid(fldPath.Child("targetValue"), src.TargetValue, "must be positive"))
+	}
+
+	return allErrs
+}
+
 func validatePodsSource(src *autoscaling.PodsMetricSource, fldPath *field.Path) field.ErrorList {
 	allErrs := field.ErrorList{}
 
diff --git a/pkg/apis/autoscaling/validation/validation_test.go b/pkg/apis/autoscaling/validation/validation_test.go
index d334a77b3c9..665afd50209 100644
--- a/pkg/apis/autoscaling/validation/validation_test.go
+++ b/pkg/apis/autoscaling/validation/validation_test.go
@@ -202,6 +202,62 @@ func TestValidateHorizontalPodAutoscaler(t *testing.T) {
 				},
 			},
 		},
+		{
+			ObjectMeta: metav1.ObjectMeta{
+				Name:      "myautoscaler",
+				Namespace: metav1.NamespaceDefault,
+			},
+			Spec: autoscaling.HorizontalPodAutoscalerSpec{
+				ScaleTargetRef: autoscaling.CrossVersionObjectReference{
+					Kind: "ReplicationController",
+					Name: "myrc",
+				},
+				MinReplicas: newInt32(1),
+				MaxReplicas: 5,
+				Metrics: []autoscaling.MetricSpec{
+					{
+						Type: autoscaling.ExternalMetricSourceType,
+						External: &autoscaling.ExternalMetricSource{
+							MetricName: "some/metric",
+							MetricSelector: &metav1.LabelSelector{
+								MatchLabels: map[string]string{
+									"label": "value",
+								},
+							},
+							TargetValue: resource.NewMilliQuantity(300, resource.DecimalSI),
+						},
+					},
+				},
+			},
+		},
+		{
+			ObjectMeta: metav1.ObjectMeta{
+				Name:      "myautoscaler",
+				Namespace: metav1.NamespaceDefault,
+			},
+			Spec: autoscaling.HorizontalPodAutoscalerSpec{
+				ScaleTargetRef: autoscaling.CrossVersionObjectReference{
+					Kind: "ReplicationController",
+					Name: "myrc",
+				},
+				MinReplicas: newInt32(1),
+				MaxReplicas: 5,
+				Metrics: []autoscaling.MetricSpec{
+					{
+						Type: autoscaling.ExternalMetricSourceType,
+						External: &autoscaling.ExternalMetricSource{
+							MetricName: "some/metric",
+							MetricSelector: &metav1.LabelSelector{
+								MatchLabels: map[string]string{
+									"label": "value",
+								},
+							},
+							TargetAverageValue: resource.NewMilliQuantity(300, resource.DecimalSI),
+						},
+					},
+				},
+			},
+		},
 	}
 	for _, successCase := range successCases {
 		if errs := ValidateHorizontalPodAutoscaler(&successCase); len(errs) != 0 {
@@ -487,6 +543,130 @@ func TestValidateHorizontalPodAutoscaler(t *testing.T) {
 			},
 			msg: "must specify a metric name",
 		},
+		{
+			horizontalPodAutoscaler: autoscaling.HorizontalPodAutoscaler{
+				ObjectMeta: metav1.ObjectMeta{Name: "myautoscaler", Namespace: metav1.NamespaceDefault},
+				Spec: autoscaling.HorizontalPodAutoscalerSpec{
+					ScaleTargetRef: autoscaling.CrossVersionObjectReference{Name: "myrc", Kind: "ReplicationController"},
+					MinReplicas:    newInt32(1),
+					MaxReplicas:    5,
+					Metrics: []autoscaling.MetricSpec{
+						{
+							Type: autoscaling.ExternalMetricSourceType,
+							External: &autoscaling.ExternalMetricSource{
+								MetricSelector: &metav1.LabelSelector{
+									MatchLabels: map[string]string{
+										"label": "value",
+									},
+								},
+								TargetValue: resource.NewMilliQuantity(300, resource.DecimalSI),
+							},
+						},
+					},
+				},
+			},
+			msg: "must specify a metric name",
+		},
+		{
+			horizontalPodAutoscaler: autoscaling.HorizontalPodAutoscaler{
+				ObjectMeta: metav1.ObjectMeta{Name: "myautoscaler", Namespace: metav1.NamespaceDefault},
+				Spec: autoscaling.HorizontalPodAutoscalerSpec{
+					ScaleTargetRef: autoscaling.CrossVersionObjectReference{Name: "myrc", Kind: "ReplicationController"},
+					MinReplicas:    newInt32(1),
+					MaxReplicas:    5,
+					Metrics: []autoscaling.MetricSpec{
+						{
+							Type: autoscaling.ExternalMetricSourceType,
+							External: &autoscaling.ExternalMetricSource{
+								MetricName: "some/metric",
+								MetricSelector: &metav1.LabelSelector{
+									MatchLabels: map[string]string{
+										"label": "value",
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+			msg: "must set either a target value for metric or a per-pod target",
+		},
+		{
+			horizontalPodAutoscaler: autoscaling.HorizontalPodAutoscaler{
+				ObjectMeta: metav1.ObjectMeta{Name: "myautoscaler", Namespace: metav1.NamespaceDefault},
+				Spec: autoscaling.HorizontalPodAutoscalerSpec{
+					ScaleTargetRef: autoscaling.CrossVersionObjectReference{Name: "myrc", Kind: "ReplicationController"},
+					MinReplicas:    newInt32(1),
+					MaxReplicas:    5,
+					Metrics: []autoscaling.MetricSpec{
+						{
+							Type: autoscaling.ExternalMetricSourceType,
+							External: &autoscaling.ExternalMetricSource{
+								MetricName: "some/metric",
+								MetricSelector: &metav1.LabelSelector{
+									MatchLabels: map[string]string{
+										"label": "value",
+									},
+								},
+								TargetValue: resource.NewMilliQuantity(-300, resource.DecimalSI),
+							},
+						},
+					},
+				},
+			},
+			msg: "must be positive",
+		},
+		{
+			horizontalPodAutoscaler: autoscaling.HorizontalPodAutoscaler{
+				ObjectMeta: metav1.ObjectMeta{Name: "myautoscaler", Namespace: metav1.NamespaceDefault},
+				Spec: autoscaling.HorizontalPodAutoscalerSpec{
+					ScaleTargetRef: autoscaling.CrossVersionObjectReference{Name: "myrc", Kind: "ReplicationController"},
+					MinReplicas:    newInt32(1),
+					MaxReplicas:    5,
+					Metrics: []autoscaling.MetricSpec{
+						{
+							Type: autoscaling.ExternalMetricSourceType,
+							External: &autoscaling.ExternalMetricSource{
+								MetricName: "some/metric",
+								MetricSelector: &metav1.LabelSelector{
+									MatchLabels: map[string]string{
+										"label": "value",
+									},
+								},
+								TargetAverageValue: resource.NewMilliQuantity(-300, resource.DecimalSI),
+							},
+						},
+					},
+				},
+			},
+			msg: "must be positive",
+		},
+		{
+			horizontalPodAutoscaler: autoscaling.HorizontalPodAutoscaler{
+				ObjectMeta: metav1.ObjectMeta{Name: "myautoscaler", Namespace: metav1.NamespaceDefault},
+				Spec: autoscaling.HorizontalPodAutoscalerSpec{
+					ScaleTargetRef: autoscaling.CrossVersionObjectReference{Name: "myrc", Kind: "ReplicationController"},
+					MinReplicas:    newInt32(1),
+					MaxReplicas:    5,
+					Metrics: []autoscaling.MetricSpec{
+						{
+							Type: autoscaling.ExternalMetricSourceType,
+							External: &autoscaling.ExternalMetricSource{
+								MetricName: "some/metric",
+								MetricSelector: &metav1.LabelSelector{
+									MatchLabels: map[string]string{
+										"label": "value",
+									},
+								},
+								TargetValue:        resource.NewMilliQuantity(300, resource.DecimalSI),
+								TargetAverageValue: resource.NewMilliQuantity(300, resource.DecimalSI),
+							},
+						},
+					},
+				},
+			},
+			msg: "may not set both a target value for metric and a per-pod target",
+		},
 		{
 			horizontalPodAutoscaler: autoscaling.HorizontalPodAutoscaler{
 				ObjectMeta: metav1.ObjectMeta{Name: "myautoscaler", Namespace: metav1.NamespaceDefault},