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521 lines
21 KiB
Go
521 lines
21 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package metrics
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import (
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"fmt"
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"sync"
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"time"
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"k8s.io/component-base/metrics"
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"k8s.io/component-base/metrics/legacyregistry"
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corev1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/types"
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utilfeature "k8s.io/apiserver/pkg/util/feature"
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"k8s.io/klog/v2"
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"k8s.io/kubernetes/pkg/features"
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kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
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)
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// This const block defines the metric names for the kubelet metrics.
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const (
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KubeletSubsystem = "kubelet"
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NodeNameKey = "node_name"
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NodeLabelKey = "node"
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PodWorkerDurationKey = "pod_worker_duration_seconds"
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PodStartDurationKey = "pod_start_duration_seconds"
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CgroupManagerOperationsKey = "cgroup_manager_duration_seconds"
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PodWorkerStartDurationKey = "pod_worker_start_duration_seconds"
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PLEGRelistDurationKey = "pleg_relist_duration_seconds"
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PLEGDiscardEventsKey = "pleg_discard_events"
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PLEGRelistIntervalKey = "pleg_relist_interval_seconds"
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PLEGLastSeenKey = "pleg_last_seen_seconds"
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EvictionsKey = "evictions"
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EvictionStatsAgeKey = "eviction_stats_age_seconds"
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PreemptionsKey = "preemptions"
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VolumeStatsCapacityBytesKey = "volume_stats_capacity_bytes"
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VolumeStatsAvailableBytesKey = "volume_stats_available_bytes"
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VolumeStatsUsedBytesKey = "volume_stats_used_bytes"
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VolumeStatsInodesKey = "volume_stats_inodes"
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VolumeStatsInodesFreeKey = "volume_stats_inodes_free"
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VolumeStatsInodesUsedKey = "volume_stats_inodes_used"
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// Metrics keys of remote runtime operations
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RuntimeOperationsKey = "runtime_operations_total"
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RuntimeOperationsDurationKey = "runtime_operations_duration_seconds"
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RuntimeOperationsErrorsKey = "runtime_operations_errors_total"
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// Metrics keys of device plugin operations
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DevicePluginRegistrationCountKey = "device_plugin_registration_total"
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DevicePluginAllocationDurationKey = "device_plugin_alloc_duration_seconds"
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// Metric keys for node config
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AssignedConfigKey = "node_config_assigned"
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ActiveConfigKey = "node_config_active"
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LastKnownGoodConfigKey = "node_config_last_known_good"
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ConfigErrorKey = "node_config_error"
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ConfigSourceLabelKey = "node_config_source"
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ConfigSourceLabelValueLocal = "local"
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ConfigUIDLabelKey = "node_config_uid"
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ConfigResourceVersionLabelKey = "node_config_resource_version"
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KubeletConfigKeyLabelKey = "node_config_kubelet_key"
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// Metrics keys for RuntimeClass
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RunPodSandboxDurationKey = "run_podsandbox_duration_seconds"
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RunPodSandboxErrorsKey = "run_podsandbox_errors_total"
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)
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var (
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// NodeName is a Gauge that tracks the ode's name. The count is always 1.
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NodeName = metrics.NewGaugeVec(
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&metrics.GaugeOpts{
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Subsystem: KubeletSubsystem,
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Name: NodeNameKey,
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Help: "The node's name. The count is always 1.",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{NodeLabelKey},
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)
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// ContainersPerPodCount is a Counter that tracks the number of containers per pod.
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ContainersPerPodCount = metrics.NewHistogram(
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&metrics.HistogramOpts{
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Subsystem: KubeletSubsystem,
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Name: "containers_per_pod_count",
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Help: "The number of containers per pod.",
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Buckets: metrics.DefBuckets,
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StabilityLevel: metrics.ALPHA,
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},
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)
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// PodWorkerDuration is a Histogram that tracks the duration (in seconds) in takes to sync a single pod.
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// Broken down by the operation type.
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PodWorkerDuration = metrics.NewHistogramVec(
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&metrics.HistogramOpts{
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Subsystem: KubeletSubsystem,
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Name: PodWorkerDurationKey,
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Help: "Duration in seconds to sync a single pod. Broken down by operation type: create, update, or sync",
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Buckets: metrics.DefBuckets,
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"operation_type"},
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)
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// PodStartDuration is a Histogram that tracks the duration (in seconds) it takes for a single pod to go from pending to running.
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PodStartDuration = metrics.NewHistogram(
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&metrics.HistogramOpts{
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Subsystem: KubeletSubsystem,
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Name: PodStartDurationKey,
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Help: "Duration in seconds for a single pod to go from pending to running.",
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Buckets: metrics.DefBuckets,
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StabilityLevel: metrics.ALPHA,
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},
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)
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// CgroupManagerDuration is a Histogram that tracks the duration (in seconds) it takes for cgroup manager operations to complete.
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// Broken down by method.
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CgroupManagerDuration = metrics.NewHistogramVec(
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&metrics.HistogramOpts{
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Subsystem: KubeletSubsystem,
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Name: CgroupManagerOperationsKey,
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Help: "Duration in seconds for cgroup manager operations. Broken down by method.",
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Buckets: metrics.DefBuckets,
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"operation_type"},
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)
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// PodWorkerStartDuration is a Histogram that tracks the duration (in seconds) it takes from seeing a pod to starting a worker.
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PodWorkerStartDuration = metrics.NewHistogram(
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&metrics.HistogramOpts{
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Subsystem: KubeletSubsystem,
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Name: PodWorkerStartDurationKey,
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Help: "Duration in seconds from seeing a pod to starting a worker.",
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Buckets: metrics.DefBuckets,
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StabilityLevel: metrics.ALPHA,
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},
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)
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// PLEGRelistDuration is a Histogram that tracks the duration (in seconds) it takes for relisting pods in the Kubelet's
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// Pod Lifecycle Event Generator (PLEG).
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PLEGRelistDuration = metrics.NewHistogram(
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&metrics.HistogramOpts{
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Subsystem: KubeletSubsystem,
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Name: PLEGRelistDurationKey,
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Help: "Duration in seconds for relisting pods in PLEG.",
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Buckets: metrics.DefBuckets,
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StabilityLevel: metrics.ALPHA,
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},
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)
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// PLEGDiscardEvents is a Counter that tracks the number of discarding events in the Kubelet's Pod Lifecycle Event Generator (PLEG).
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PLEGDiscardEvents = metrics.NewCounter(
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&metrics.CounterOpts{
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Subsystem: KubeletSubsystem,
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Name: PLEGDiscardEventsKey,
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Help: "The number of discard events in PLEG.",
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StabilityLevel: metrics.ALPHA,
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},
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)
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// PLEGRelistInterval is a Histogram that tracks the intervals (in seconds) between relisting in the Kubelet's
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// Pod Lifecycle Event Generator (PLEG).
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PLEGRelistInterval = metrics.NewHistogram(
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&metrics.HistogramOpts{
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Subsystem: KubeletSubsystem,
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Name: PLEGRelistIntervalKey,
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Help: "Interval in seconds between relisting in PLEG.",
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Buckets: metrics.DefBuckets,
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StabilityLevel: metrics.ALPHA,
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},
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)
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// PLEGLastSeen is a Gauge giving the Unix timestamp when the Kubelet's
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// Pod Lifecycle Event Generator (PLEG) was last seen active.
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PLEGLastSeen = metrics.NewGauge(
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&metrics.GaugeOpts{
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Subsystem: KubeletSubsystem,
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Name: PLEGLastSeenKey,
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Help: "Timestamp in seconds when PLEG was last seen active.",
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StabilityLevel: metrics.ALPHA,
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},
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)
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// RuntimeOperations is a Counter that tracks the cumulative number of remote runtime operations.
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// Broken down by operation type.
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RuntimeOperations = metrics.NewCounterVec(
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&metrics.CounterOpts{
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Subsystem: KubeletSubsystem,
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Name: RuntimeOperationsKey,
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Help: "Cumulative number of runtime operations by operation type.",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"operation_type"},
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)
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// RuntimeOperationsDuration is a Histogram that tracks the duration (in seconds) for remote runtime operations to complete.
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// Broken down by operation type.
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RuntimeOperationsDuration = metrics.NewHistogramVec(
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&metrics.HistogramOpts{
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Subsystem: KubeletSubsystem,
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Name: RuntimeOperationsDurationKey,
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Help: "Duration in seconds of runtime operations. Broken down by operation type.",
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Buckets: metrics.DefBuckets,
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"operation_type"},
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)
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// RuntimeOperationsErrors is a Counter that tracks the cumulative number of remote runtime operations errors.
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// Broken down by operation type.
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RuntimeOperationsErrors = metrics.NewCounterVec(
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&metrics.CounterOpts{
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Subsystem: KubeletSubsystem,
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Name: RuntimeOperationsErrorsKey,
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Help: "Cumulative number of runtime operation errors by operation type.",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"operation_type"},
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)
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// Evictions is a Counter that tracks the cumulative number of pod evictions initiated by the kubelet.
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// Broken down by eviction signal.
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Evictions = metrics.NewCounterVec(
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&metrics.CounterOpts{
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Subsystem: KubeletSubsystem,
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Name: EvictionsKey,
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Help: "Cumulative number of pod evictions by eviction signal",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"eviction_signal"},
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)
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// EvictionStatsAge is a Histogram that tracks the time (in seconds) between when stats are collected and when a pod is evicted
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// based on those stats. Broken down by eviction signal.
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EvictionStatsAge = metrics.NewHistogramVec(
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&metrics.HistogramOpts{
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Subsystem: KubeletSubsystem,
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Name: EvictionStatsAgeKey,
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Help: "Time between when stats are collected, and when pod is evicted based on those stats by eviction signal",
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Buckets: metrics.DefBuckets,
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"eviction_signal"},
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)
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// Preemptions is a Counter that tracks the cumulative number of pod preemptions initiated by the kubelet.
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// Broken down by preemption signal. A preemption is only recorded for one resource, the sum of all signals
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// is the number of preemptions on the given node.
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Preemptions = metrics.NewCounterVec(
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&metrics.CounterOpts{
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Subsystem: KubeletSubsystem,
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Name: PreemptionsKey,
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Help: "Cumulative number of pod preemptions by preemption resource",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"preemption_signal"},
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)
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// DevicePluginRegistrationCount is a Counter that tracks the cumulative number of device plugin registrations.
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// Broken down by resource name.
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DevicePluginRegistrationCount = metrics.NewCounterVec(
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&metrics.CounterOpts{
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Subsystem: KubeletSubsystem,
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Name: DevicePluginRegistrationCountKey,
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Help: "Cumulative number of device plugin registrations. Broken down by resource name.",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"resource_name"},
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)
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// DevicePluginAllocationDuration is a Histogram that tracks the duration (in seconds) to serve a device plugin allocation request.
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// Broken down by resource name.
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DevicePluginAllocationDuration = metrics.NewHistogramVec(
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&metrics.HistogramOpts{
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Subsystem: KubeletSubsystem,
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Name: DevicePluginAllocationDurationKey,
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Help: "Duration in seconds to serve a device plugin Allocation request. Broken down by resource name.",
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Buckets: metrics.DefBuckets,
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"resource_name"},
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)
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// Metrics for node config
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// AssignedConfig is a Gauge that is set 1 if the Kubelet has a NodeConfig assigned.
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AssignedConfig = metrics.NewGaugeVec(
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&metrics.GaugeOpts{
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Subsystem: KubeletSubsystem,
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Name: AssignedConfigKey,
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Help: "The node's understanding of intended config. The count is always 1.",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{ConfigSourceLabelKey, ConfigUIDLabelKey, ConfigResourceVersionLabelKey, KubeletConfigKeyLabelKey},
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)
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// ActiveConfig is a Gauge that is set to 1 if the Kubelet has an active NodeConfig.
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ActiveConfig = metrics.NewGaugeVec(
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&metrics.GaugeOpts{
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Subsystem: KubeletSubsystem,
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Name: ActiveConfigKey,
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Help: "The config source the node is actively using. The count is always 1.",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{ConfigSourceLabelKey, ConfigUIDLabelKey, ConfigResourceVersionLabelKey, KubeletConfigKeyLabelKey},
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)
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// LastKnownGoodConfig is a Gauge that is set to 1 if the Kubelet has a NodeConfig it can fall back to if there
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// are certain errors.
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LastKnownGoodConfig = metrics.NewGaugeVec(
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&metrics.GaugeOpts{
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Subsystem: KubeletSubsystem,
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Name: LastKnownGoodConfigKey,
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Help: "The config source the node will fall back to when it encounters certain errors. The count is always 1.",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{ConfigSourceLabelKey, ConfigUIDLabelKey, ConfigResourceVersionLabelKey, KubeletConfigKeyLabelKey},
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)
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// ConfigError is a Gauge that is set to 1 if the node is experiencing a configuration-related error.
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ConfigError = metrics.NewGauge(
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&metrics.GaugeOpts{
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Subsystem: KubeletSubsystem,
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Name: ConfigErrorKey,
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Help: "This metric is true (1) if the node is experiencing a configuration-related error, false (0) otherwise.",
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StabilityLevel: metrics.ALPHA,
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},
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)
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// RunPodSandboxDuration is a Histogram that tracks the duration (in seconds) it takes to run Pod Sandbox operations.
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// Broken down by RuntimeClass.Handler.
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RunPodSandboxDuration = metrics.NewHistogramVec(
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&metrics.HistogramOpts{
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Subsystem: KubeletSubsystem,
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Name: RunPodSandboxDurationKey,
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Help: "Duration in seconds of the run_podsandbox operations. Broken down by RuntimeClass.Handler.",
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// Use DefBuckets for now, will customize the buckets if necessary.
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Buckets: metrics.DefBuckets,
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"runtime_handler"},
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)
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// RunPodSandboxErrors is a Counter that tracks the cumulative number of Pod Sandbox operations errors.
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// Broken down by RuntimeClass.Handler.
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RunPodSandboxErrors = metrics.NewCounterVec(
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&metrics.CounterOpts{
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Subsystem: KubeletSubsystem,
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Name: RunPodSandboxErrorsKey,
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Help: "Cumulative number of the run_podsandbox operation errors by RuntimeClass.Handler.",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"runtime_handler"},
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)
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// RunningPodCount is a gauge that tracks the number of Pods currently running
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RunningPodCount = metrics.NewGauge(
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&metrics.GaugeOpts{
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Subsystem: KubeletSubsystem,
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Name: "running_pods",
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Help: "Number of pods currently running",
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StabilityLevel: metrics.ALPHA,
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},
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)
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// RunningContainerCount is a gauge that tracks the number of containers currently running
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RunningContainerCount = metrics.NewGaugeVec(
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&metrics.GaugeOpts{
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Subsystem: KubeletSubsystem,
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Name: "running_containers",
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Help: "Number of containers currently running",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"container_state"},
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)
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)
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var registerMetrics sync.Once
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// Register registers all metrics.
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func Register(containerCache kubecontainer.RuntimeCache, collectors ...metrics.StableCollector) {
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// Register the metrics.
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registerMetrics.Do(func() {
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legacyregistry.MustRegister(NodeName)
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legacyregistry.MustRegister(PodWorkerDuration)
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legacyregistry.MustRegister(PodStartDuration)
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legacyregistry.MustRegister(CgroupManagerDuration)
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legacyregistry.MustRegister(PodWorkerStartDuration)
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legacyregistry.MustRegister(ContainersPerPodCount)
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legacyregistry.MustRegister(PLEGRelistDuration)
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legacyregistry.MustRegister(PLEGDiscardEvents)
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legacyregistry.MustRegister(PLEGRelistInterval)
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legacyregistry.MustRegister(PLEGLastSeen)
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legacyregistry.MustRegister(RuntimeOperations)
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legacyregistry.MustRegister(RuntimeOperationsDuration)
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legacyregistry.MustRegister(RuntimeOperationsErrors)
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legacyregistry.MustRegister(Evictions)
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legacyregistry.MustRegister(EvictionStatsAge)
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legacyregistry.MustRegister(Preemptions)
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legacyregistry.MustRegister(DevicePluginRegistrationCount)
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legacyregistry.MustRegister(DevicePluginAllocationDuration)
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legacyregistry.MustRegister(RunningContainerCount)
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legacyregistry.MustRegister(RunningPodCount)
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legacyregistry.MustRegister(RunPodSandboxDuration)
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legacyregistry.MustRegister(RunPodSandboxErrors)
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if utilfeature.DefaultFeatureGate.Enabled(features.DynamicKubeletConfig) {
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legacyregistry.MustRegister(AssignedConfig)
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legacyregistry.MustRegister(ActiveConfig)
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legacyregistry.MustRegister(LastKnownGoodConfig)
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legacyregistry.MustRegister(ConfigError)
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}
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for _, collector := range collectors {
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legacyregistry.CustomMustRegister(collector)
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}
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})
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}
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// GetGather returns the gatherer. It used by test case outside current package.
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func GetGather() metrics.Gatherer {
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return legacyregistry.DefaultGatherer
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}
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// SinceInSeconds gets the time since the specified start in seconds.
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func SinceInSeconds(start time.Time) float64 {
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return time.Since(start).Seconds()
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}
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const configMapAPIPathFmt = "/api/v1/namespaces/%s/configmaps/%s"
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func configLabels(source *corev1.NodeConfigSource) (map[string]string, error) {
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if source == nil {
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return map[string]string{
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// prometheus requires all of the labels that can be set on the metric
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ConfigSourceLabelKey: "local",
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ConfigUIDLabelKey: "",
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ConfigResourceVersionLabelKey: "",
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KubeletConfigKeyLabelKey: "",
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}, nil
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}
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if source.ConfigMap != nil {
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return map[string]string{
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ConfigSourceLabelKey: fmt.Sprintf(configMapAPIPathFmt, source.ConfigMap.Namespace, source.ConfigMap.Name),
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ConfigUIDLabelKey: string(source.ConfigMap.UID),
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ConfigResourceVersionLabelKey: source.ConfigMap.ResourceVersion,
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KubeletConfigKeyLabelKey: source.ConfigMap.KubeletConfigKey,
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}, nil
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}
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return nil, fmt.Errorf("unrecognized config source type, all source subfields were nil")
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}
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// track labels across metric updates, so we can delete old label sets and prevent leaks
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var assignedConfigLabels map[string]string
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// SetAssignedConfig tracks labels according to the assigned NodeConfig. It also tracks labels
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// across metric updates so old labels can be safely deleted.
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func SetAssignedConfig(source *corev1.NodeConfigSource) error {
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// compute the timeseries labels from the source
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labels, err := configLabels(source)
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if err != nil {
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return err
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}
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// clean up the old timeseries (WithLabelValues creates a new one for each distinct label set)
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if !AssignedConfig.Delete(assignedConfigLabels) {
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klog.Warningf("Failed to delete metric for labels %v. This may result in ambiguity from multiple metrics concurrently indicating different assigned configs.", assignedConfigLabels)
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}
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// record the new timeseries
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assignedConfigLabels = labels
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// expose the new timeseries with a constant count of 1
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AssignedConfig.With(assignedConfigLabels).Set(1)
|
|
return nil
|
|
}
|
|
|
|
// track labels across metric updates, so we can delete old label sets and prevent leaks
|
|
var activeConfigLabels map[string]string
|
|
|
|
// SetActiveConfig tracks labels according to the NodeConfig that is currently used by the Kubelet.
|
|
// It also tracks labels across metric updates so old labels can be safely deleted.
|
|
func SetActiveConfig(source *corev1.NodeConfigSource) error {
|
|
// compute the timeseries labels from the source
|
|
labels, err := configLabels(source)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// clean up the old timeseries (WithLabelValues creates a new one for each distinct label set)
|
|
if !ActiveConfig.Delete(activeConfigLabels) {
|
|
klog.Warningf("Failed to delete metric for labels %v. This may result in ambiguity from multiple metrics concurrently indicating different active configs.", activeConfigLabels)
|
|
}
|
|
// record the new timeseries
|
|
activeConfigLabels = labels
|
|
// expose the new timeseries with a constant count of 1
|
|
ActiveConfig.With(activeConfigLabels).Set(1)
|
|
return nil
|
|
}
|
|
|
|
// track labels across metric updates, so we can delete old label sets and prevent leaks
|
|
var lastKnownGoodConfigLabels map[string]string
|
|
|
|
// SetLastKnownGoodConfig tracks labels according to the NodeConfig that was successfully applied last.
|
|
// It also tracks labels across metric updates so old labels can be safely deleted.
|
|
func SetLastKnownGoodConfig(source *corev1.NodeConfigSource) error {
|
|
// compute the timeseries labels from the source
|
|
labels, err := configLabels(source)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// clean up the old timeseries (WithLabelValues creates a new one for each distinct label set)
|
|
if !LastKnownGoodConfig.Delete(lastKnownGoodConfigLabels) {
|
|
klog.Warningf("Failed to delete metric for labels %v. This may result in ambiguity from multiple metrics concurrently indicating different last known good configs.", lastKnownGoodConfigLabels)
|
|
}
|
|
// record the new timeseries
|
|
lastKnownGoodConfigLabels = labels
|
|
// expose the new timeseries with a constant count of 1
|
|
LastKnownGoodConfig.With(lastKnownGoodConfigLabels).Set(1)
|
|
return nil
|
|
}
|
|
|
|
// SetConfigError sets a the ConfigError metric to 1 in case any errors were encountered.
|
|
func SetConfigError(err bool) {
|
|
if err {
|
|
ConfigError.Set(1)
|
|
} else {
|
|
ConfigError.Set(0)
|
|
}
|
|
}
|
|
|
|
// SetNodeName sets the NodeName Gauge to 1.
|
|
func SetNodeName(name types.NodeName) {
|
|
NodeName.WithLabelValues(string(name)).Set(1)
|
|
}
|