Merge pull request #24220 from gmarek/metrics

Automatic merge from submit-queue

Generated clients can return their RESTClients, RESTClient can return its RateLimiter

cc @lavalamp @krousey @wojtek-t @smarterclayton @timothysc 

Ref. #22421

pkg/controller/node/nodecontroller.go

@@ -41,6 +41,7 @@ import (
 	"k8s.io/kubernetes/pkg/runtime"
 	"k8s.io/kubernetes/pkg/types"
 	"k8s.io/kubernetes/pkg/util/flowcontrol"
+	"k8s.io/kubernetes/pkg/util/metrics"
 	utilruntime "k8s.io/kubernetes/pkg/util/runtime"
 	"k8s.io/kubernetes/pkg/util/sets"
 	"k8s.io/kubernetes/pkg/util/wait"
@@ -145,6 +146,11 @@ func NewNodeController(
 	} else {
 		glog.Infof("No api server defined - no events will be sent to API server.")
 	}
+
+	if kubeClient != nil && kubeClient.Core().GetRESTClient().GetRateLimiter() != nil {
+		metrics.RegisterMetricAndTrackRateLimiterUsage("node_controller", kubeClient.Core().GetRESTClient().GetRateLimiter())
+	}
+
 	if allocateNodeCIDRs && clusterCIDR == nil {
 		glog.Fatal("NodeController: Must specify clusterCIDR if allocateNodeCIDRs == true.")
 	}