Merge pull request #59727 from wgliang/master.time

Automatic merge from submit-queue. 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>.

should use time.Since instead of time.Now().Sub

**What this PR does / why we need it**:
should use time.Since instead of time.Now().Sub

**Special notes for your reviewer**:

pkg/controller/namespace/namespace_controller.go

@@ -163,7 +163,7 @@ func (nm *NamespaceController) worker() {
 func (nm *NamespaceController) syncNamespaceFromKey(key string) (err error) {
 	startTime := time.Now()
 	defer func() {
-		glog.V(4).Infof("Finished syncing namespace %q (%v)", key, time.Now().Sub(startTime))
+		glog.V(4).Infof("Finished syncing namespace %q (%v)", key, time.Since(startTime))
 	}()
 
 	namespace, err := nm.lister.Get(key)