remove rate limiter metric as it is not in use

Change-Id: I91157653e3860eeecc3f572aee88da6ffc65faed

pkg/controller/nodelifecycle/node_lifecycle_controller.go

@@ -50,7 +50,6 @@ import (
 	"k8s.io/client-go/tools/record"
 	"k8s.io/client-go/util/flowcontrol"
 	"k8s.io/client-go/util/workqueue"
-	"k8s.io/component-base/metrics/prometheus/ratelimiter"
 	nodetopology "k8s.io/component-helpers/node/topology"
 	kubeletapis "k8s.io/kubelet/pkg/apis"
 	"k8s.io/kubernetes/pkg/controller"
@@ -373,10 +372,6 @@ func NewNodeLifecycleController(
 	eventBroadcaster := record.NewBroadcaster()
 	recorder := eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: "node-controller"})
 
-	if kubeClient.CoreV1().RESTClient().GetRateLimiter() != nil {
-		ratelimiter.RegisterMetricAndTrackRateLimiterUsage("node_lifecycle_controller", kubeClient.CoreV1().RESTClient().GetRateLimiter())
-	}
-
 	nc := &Controller{
 		kubeClient:                  kubeClient,
 		now:                         metav1.Now,