Merge pull request #67809 from Pingan2017/dafaultfitler

Automatic merge from submit-queue (batch tested with PRs 67362, 67256, 67809). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

del unused func DefaultEventFilterFunc

**What this PR does / why we need it**:

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

staging/src/k8s.io/client-go/tools/record/events_cache.go

@@ -84,11 +84,6 @@ func getSpamKey(event *v1.Event) string {
 // EventFilterFunc is a function that returns true if the event should be skipped
 type EventFilterFunc func(event *v1.Event) bool
 
-// DefaultEventFilterFunc returns false for all incoming events
-func DefaultEventFilterFunc(event *v1.Event) bool {
-	return false
-}
-
 // EventSourceObjectSpamFilter is responsible for throttling
 // the amount of events a source and object can produce.
 type EventSourceObjectSpamFilter struct {

staging/src/k8s.io/client-go/tools/record/events_cache_test.go

@@ -127,14 +127,6 @@ func validateEvent(messagePrefix string, actualEvent *v1.Event, expectedEvent *v
 	return actualEvent, nil
 }
 
-// TestDefaultEventFilterFunc ensures that no events are filtered
-func TestDefaultEventFilterFunc(t *testing.T) {
-	event := makeEvent("end-of-world", "it was fun", makeObjectReference("Pod", "pod1", "other"))
-	if DefaultEventFilterFunc(&event) {
-		t.Fatalf("DefaultEventFilterFunc should always return false")
-	}
-}
-
 // TestEventAggregatorByReasonFunc ensures that two events are aggregated if they vary only by event.message
 func TestEventAggregatorByReasonFunc(t *testing.T) {
 	event1 := makeEvent("end-of-world", "it was fun", makeObjectReference("Pod", "pod1", "other"))