UPSTREAM: <carry>: Revert "Adding config for event filtering"

This reverts commit 6601bf0. See kubernetes#2495

cluster-autoscaler/utils/kubernetes/factory.go

@@ -17,30 +17,19 @@ limitations under the License.
 package kubernetes
 
 import (
-	"strings"
-
 	clientv1 "k8s.io/api/core/v1"
 	clientset "k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/kubernetes/fake"
 	"k8s.io/client-go/kubernetes/scheme"
 	v1core "k8s.io/client-go/kubernetes/typed/core/v1"
 	kube_record "k8s.io/client-go/tools/record"
-)
-
-const (
-	// Rate of refill for the event spam filter in client go
-	// 1 per event key per 5 minutes.
-	defaultQPS = 1. / 300.
-	// Number of events allowed per event key before rate limiting is triggered
-	// Has to greater than or equal to 1.
-	defaultBurstSize = 1
-	// Number of distinct event keys in the rate limiting cache.
-	defaultLRUCache = 8192
+	klog "k8s.io/klog/v2"
 )
 
 // CreateEventRecorder creates an event recorder to send custom events to Kubernetes to be recorded for targeted Kubernetes objects
 func CreateEventRecorder(kubeClient clientset.Interface) kube_record.EventRecorder {
-	eventBroadcaster := kube_record.NewBroadcasterWithCorrelatorOptions(getCorrelationOptions())
+	eventBroadcaster := kube_record.NewBroadcaster()
+	eventBroadcaster.StartLogging(klog.V(4).Infof)
 	if _, isfake := kubeClient.(*fake.Clientset); !isfake {
 		actualSink := &v1core.EventSinkImpl{Interface: v1core.New(kubeClient.CoreV1().RESTClient()).Events("")}
 		// EventBroadcaster has a StartLogging() method but the throttling options from getCorrelationOptions() get applied only to
@@ -53,37 +42,3 @@ func CreateEventRecorder(kubeClient clientset.Interface) kube_record.EventRecord
 	}
 	return eventBroadcaster.NewRecorder(scheme.Scheme, clientv1.EventSource{Component: "cluster-autoscaler"})
 }
-
-func getCorrelationOptions() kube_record.CorrelatorOptions {
-	return kube_record.CorrelatorOptions{
-		QPS:          defaultQPS,
-		BurstSize:    defaultBurstSize,
-		LRUCacheSize: defaultLRUCache,
-		SpamKeyFunc:  getCustomSpamKeyFunc(),
-	}
-}
-
-// getCustomSpamKeyFunc returns EventSpamKeyFunc to be used by EventBroadcaster.
-// By default only defaultBurstSize events are allowed to be sent per each
-// event.Source-event.InvolvedObject combination. We want to emit defaultBurstSize events per each
-// Reason-Source-InvolvedObject combination and for cluster-autoscaler-status ConfigMap we
-// want to emit all of the events, thus we provide custom SpamKeyFunc
-func getCustomSpamKeyFunc() kube_record.EventSpamKeyFunc {
-	return func(event *clientv1.Event) string {
-		elementsToJoin := []string{
-			event.Reason,
-			event.Source.Component,
-			event.Source.Host,
-			event.InvolvedObject.Kind,
-			event.InvolvedObject.Namespace,
-			event.InvolvedObject.Name,
-			string(event.InvolvedObject.UID),
-			event.InvolvedObject.APIVersion,
-		}
-		// In case of cluster-autoscaler-status config map we want to emit all of the events, so we use event.Message as a key.
-		if event.InvolvedObject.Name == "cluster-autoscaler-status" && event.InvolvedObject.Namespace == "kube-system" && event.InvolvedObject.Kind == "ConfigMap" {
-			elementsToJoin = []string{event.Message}
-		}
-		return strings.Join(elementsToJoin, "")
-	}
-}