Remove GC rate limiter metrics

pkg/controller/garbagecollector/BUILD

@@ -15,13 +15,11 @@ go_library(
         "graph_builder.go",
         "operations.go",
         "patch.go",
-        "rate_limiter_helper.go",
         "uid_cache.go",
     ],
     deps = [
         "//pkg/controller:go_default_library",
         "//pkg/controller/garbagecollector/metaonly:go_default_library",
-        "//pkg/util/metrics:go_default_library",
         "//pkg/util/reflector/prometheus:go_default_library",
         "//pkg/util/workqueue/prometheus:go_default_library",
         "//vendor/github.com/golang/glog:go_default_library",

pkg/controller/garbagecollector/garbagecollector.go

@@ -69,9 +69,6 @@ type GarbageCollector struct {
 	// garbage collector attempts to orphan the dependents of the items in the attemptToOrphan queue, then deletes the items.
 	attemptToOrphan        workqueue.RateLimitingInterface
 	dependencyGraphBuilder *GraphBuilder
-	// used to register exactly once the rate limiter of the dynamic client
-	// used by the garbage collector controller.
-	registeredRateLimiter *RegisteredRateLimiter
 	// GC caches the owners that do not exist according to the API server.
 	absentOwnerCache *UIDCache
 	sharedInformers  informers.SharedInformerFactory
@@ -92,19 +89,17 @@ func NewGarbageCollector(
 	attemptToOrphan := workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "garbage_collector_attempt_to_orphan")
 	absentOwnerCache := NewUIDCache(500)
 	gc := &GarbageCollector{
-		clientPool:            clientPool,
-		restMapper:            mapper,
-		attemptToDelete:       attemptToDelete,
-		attemptToOrphan:       attemptToOrphan,
-		registeredRateLimiter: NewRegisteredRateLimiter(deletableResources),
-		absentOwnerCache:      absentOwnerCache,
+		clientPool:       clientPool,
+		restMapper:       mapper,
+		attemptToDelete:  attemptToDelete,
+		attemptToOrphan:  attemptToOrphan,
+		absentOwnerCache: absentOwnerCache,
 	}
 	gb := &GraphBuilder{
-		metaOnlyClientPool:                  metaOnlyClientPool,
-		informersStarted:                    informersStarted,
-		registeredRateLimiterForControllers: NewRegisteredRateLimiter(deletableResources),
-		restMapper:                          mapper,
-		graphChanges:                        workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "garbage_collector_graph_changes"),
+		metaOnlyClientPool: metaOnlyClientPool,
+		informersStarted:   informersStarted,
+		restMapper:         mapper,
+		graphChanges:       workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "garbage_collector_graph_changes"),
 		uidToNode: &concurrentUIDToNode{
 			uidToNode: make(map[types.UID]*node),
 		},

pkg/controller/garbagecollector/graph_builder.go

@@ -92,9 +92,6 @@ type GraphBuilder struct {
 	// metaOnlyClientPool uses a special codec, which removes fields except for
 	// apiVersion, kind, and metadata during decoding.
 	metaOnlyClientPool dynamic.ClientPool
-	// used to register exactly once the rate limiters of the clients used by
-	// the `monitors`.
-	registeredRateLimiterForControllers *RegisteredRateLimiter
 	// monitors are the producer of the graphChanges queue, graphBuilder alters
 	// the in-memory graph according to the changes.
 	graphChanges workqueue.RateLimitingInterface
@@ -204,8 +201,6 @@ func (gb *GraphBuilder) controllerFor(resource schema.GroupVersionResource, kind
 	if err != nil {
 		return nil, err
 	}
-	// TODO: since the gv is never unregistered, isn't this a memory leak?
-	gb.registeredRateLimiterForControllers.registerIfNotPresent(resource.GroupVersion(), client, "garbage_collector_monitoring")
 	_, monitor := cache.NewInformer(
 		listWatcher(client, resource),
 		nil,

pkg/controller/garbagecollector/operations.go

@@ -50,7 +50,9 @@ func (gc *GarbageCollector) apiResource(apiVersion, kind string, namespaced bool
 func (gc *GarbageCollector) deleteObject(item objectReference, policy *metav1.DeletionPropagation) error {
 	fqKind := schema.FromAPIVersionAndKind(item.APIVersion, item.Kind)
 	client, err := gc.clientPool.ClientForGroupVersionKind(fqKind)
-	gc.registeredRateLimiter.registerIfNotPresent(fqKind.GroupVersion(), client, "garbage_collector_operation")
+	if err != nil {
+		return err
+	}
 	resource, err := gc.apiResource(item.APIVersion, item.Kind, len(item.Namespace) != 0)
 	if err != nil {
 		return err
@@ -64,7 +66,9 @@ func (gc *GarbageCollector) deleteObject(item objectReference, policy *metav1.De
 func (gc *GarbageCollector) getObject(item objectReference) (*unstructured.Unstructured, error) {
 	fqKind := schema.FromAPIVersionAndKind(item.APIVersion, item.Kind)
 	client, err := gc.clientPool.ClientForGroupVersionKind(fqKind)
-	gc.registeredRateLimiter.registerIfNotPresent(fqKind.GroupVersion(), client, "garbage_collector_operation")
+	if err != nil {
+		return nil, err
+	}
 	resource, err := gc.apiResource(item.APIVersion, item.Kind, len(item.Namespace) != 0)
 	if err != nil {
 		return nil, err
@@ -75,7 +79,9 @@ func (gc *GarbageCollector) getObject(item objectReference) (*unstructured.Unstr
 func (gc *GarbageCollector) updateObject(item objectReference, obj *unstructured.Unstructured) (*unstructured.Unstructured, error) {
 	fqKind := schema.FromAPIVersionAndKind(item.APIVersion, item.Kind)
 	client, err := gc.clientPool.ClientForGroupVersionKind(fqKind)
-	gc.registeredRateLimiter.registerIfNotPresent(fqKind.GroupVersion(), client, "garbage_collector_operation")
+	if err != nil {
+		return nil, err
+	}
 	resource, err := gc.apiResource(item.APIVersion, item.Kind, len(item.Namespace) != 0)
 	if err != nil {
 		return nil, err
@@ -86,7 +92,9 @@ func (gc *GarbageCollector) updateObject(item objectReference, obj *unstructured
 func (gc *GarbageCollector) patchObject(item objectReference, patch []byte) (*unstructured.Unstructured, error) {
 	fqKind := schema.FromAPIVersionAndKind(item.APIVersion, item.Kind)
 	client, err := gc.clientPool.ClientForGroupVersionKind(fqKind)
-	gc.registeredRateLimiter.registerIfNotPresent(fqKind.GroupVersion(), client, "garbage_collector_operation")
+	if err != nil {
+		return nil, err
+	}
 	resource, err := gc.apiResource(item.APIVersion, item.Kind, len(item.Namespace) != 0)
 	if err != nil {
 		return nil, err

pkg/controller/garbagecollector/rate_limiter_helper.go

-/*
-Copyright 2016 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 garbagecollector
-
-import (
-	"fmt"
-	"strings"
-	"sync"
-
-	"k8s.io/apimachinery/pkg/runtime/schema"
-	"k8s.io/client-go/dynamic"
-	"k8s.io/kubernetes/pkg/util/metrics"
-)
-
-// RegisteredRateLimiter records the registered RateLimters to avoid
-// duplication.
-type RegisteredRateLimiter struct {
-	rateLimiters map[schema.GroupVersion]*sync.Once
-}
-
-// NewRegisteredRateLimiter returns a new RegisteredRateLimiter.
-// TODO: NewRegisteredRateLimiter is not dynamic. We need to find a better way
-// when GC dynamically change the resources it monitors.
-func NewRegisteredRateLimiter(resources map[schema.GroupVersionResource]struct{}) *RegisteredRateLimiter {
-	rateLimiters := make(map[schema.GroupVersion]*sync.Once)
-	for resource := range resources {
-		gv := resource.GroupVersion()
-		if _, found := rateLimiters[gv]; !found {
-			rateLimiters[gv] = &sync.Once{}
-		}
-	}
-	return &RegisteredRateLimiter{rateLimiters: rateLimiters}
-}
-
-func (r *RegisteredRateLimiter) registerIfNotPresent(gv schema.GroupVersion, client dynamic.Interface, prefix string) {
-	once, found := r.rateLimiters[gv]
-	if !found {
-		return
-	}
-	once.Do(func() {
-		if rateLimiter := client.GetRateLimiter(); rateLimiter != nil {
-			group := strings.Replace(gv.Group, ".", ":", -1)
-			metrics.RegisterMetricAndTrackRateLimiterUsage(fmt.Sprintf("%s_%s_%s", prefix, group, gv.Version), rateLimiter)
-		}
-	})
-}