Merge pull request #43016 from liggitt/time-added-pointer

Automatic merge from submit-queue (batch tested with PRs 43016, 50503, 51281, 51518, 51582). 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>..

Omit timeAdded from taint when empty

Fixes omitempty portion of https://github.com/kubernetes/kubernetes/issues/42394

pkg/controller/daemon/daemon_controller_test.go

@@ -63,17 +63,22 @@ var (
 	noExecuteTaints       = []v1.Taint{{Key: "dedicated", Value: "user1", Effect: "NoExecute"}}
 )
 
+func nowPointer() *metav1.Time {
+	now := metav1.Now()
+	return &now
+}
+
 var (
 	nodeNotReady = []v1.Taint{{
 		Key:       algorithm.TaintNodeNotReady,
 		Effect:    v1.TaintEffectNoExecute,
-		TimeAdded: metav1.Now(),
+		TimeAdded: nowPointer(),
 	}}
 
 	nodeUnreachable = []v1.Taint{{
 		Key:       algorithm.TaintNodeUnreachable,
 		Effect:    v1.TaintEffectNoExecute,
-		TimeAdded: metav1.Now(),
+		TimeAdded: nowPointer(),
 	}}
 )