Add metrics for cloud-provider node sync, update.

staging/src/k8s.io/cloud-provider/controllers/node/metrics.go

@@ -0,0 +1,59 @@
+/*
+Copyright 2023 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package cloud
+
+import (
+	"sync"
+
+	"k8s.io/component-base/metrics"
+	"k8s.io/component-base/metrics/legacyregistry"
+)
+
+const (
+	metricsSubsystem = "node_controller"
+)
+
+var (
+	removeCloudProviderTaintDelay = metrics.NewHistogram(
+		&metrics.HistogramOpts{
+			Subsystem:      metricsSubsystem,
+			Name:           "cloud_provider_taint_removal_delay_seconds",
+			Help:           "Number of seconds after node creation when NodeController removed the cloud-provider taint of a single node.",
+			Buckets:        metrics.ExponentialBuckets(1, 4, 6), // 1s -> ~17m
+			StabilityLevel: metrics.ALPHA,
+		},
+	)
+	initialNodeSyncDelay = metrics.NewHistogram(
+		&metrics.HistogramOpts{
+			Subsystem:      metricsSubsystem,
+			Name:           "initial_node_sync_delay_seconds",
+			Help:           "Number of seconds after node creation when NodeController finished the initial synchronization of a single node.",
+			Buckets:        metrics.ExponentialBuckets(1, 4, 6), // 1s -> ~17m
+			StabilityLevel: metrics.ALPHA,
+		},
+	)
+)
+
+var metricRegistration sync.Once
+
+// registerMetrics registers the metrics that are to be monitored.
+func registerMetrics() {
+	metricRegistration.Do(func() {
+		legacyregistry.MustRegister(removeCloudProviderTaintDelay)
+		legacyregistry.MustRegister(initialNodeSyncDelay)
+	})
+}

staging/src/k8s.io/cloud-provider/controllers/node/node_controller.go

@@ -48,6 +48,10 @@ import (
 	"k8s.io/klog/v2"
 )
 
+func init() {
+	registerMetrics()
+}
+
 // labelReconcileInfo lists Node labels to reconcile, and how to reconcile them.
 // primaryKey and secondaryKey are keys of labels to reconcile.
 //   - If both keys exist, but their values don't match. Use the value from the
@@ -489,6 +493,8 @@ func (cnc *CloudNodeController) syncNode(ctx context.Context, nodeName string) e
 			return err
 		}
 
+		removeCloudProviderTaintDelay.Observe(time.Since(newNode.ObjectMeta.CreationTimestamp.Time).Seconds())
+
 		// After adding, call UpdateNodeAddress to set the CloudProvider provided IPAddresses
 		// So that users do not see any significant delay in IP addresses being filled into the node
 		cnc.updateNodeAddress(ctx, newNode, instanceMetadata)
@@ -501,6 +507,7 @@ func (cnc *CloudNodeController) syncNode(ctx context.Context, nodeName string) e
 	}
 
 	cnc.recorder.Event(copyNode, v1.EventTypeNormal, "Synced", "Node synced successfully")
+	initialNodeSyncDelay.Observe(time.Since(curNode.ObjectMeta.CreationTimestamp.Time).Seconds())
 	return nil
 }