Merge pull request #8023 from k8s-infra-cherrypick-robot/cherry-pick-8011-to-cluster-autoscaler-release-1.31

[cluster-autoscaler-release-1.31] Allow draining when StatefulSet kind has custom API Group

Author: k8s-ci-robot

cluster-autoscaler/simulator/drainability/rules/replicacount/rule.go

@@ -111,6 +111,11 @@ func (r *Rule) Drainable(drainCtx *drainability.DrainContext, pod *apiv1.Pod, _
 			return drainability.NewBlockedStatus(drain.ControllerNotFound, fmt.Errorf("replication controller for %s/%s is not available, err: %v", pod.Namespace, pod.Name, err))
 		}
 	} else if refKind == "StatefulSet" {
+		if refGroup.Group != "apps" {
+			// We don't have a listener for the other StatefulSet group.
+			return drainability.NewUndefinedStatus()
+		}
+
 		ss, err := drainCtx.Listers.StatefulSetLister().StatefulSets(controllerNamespace).Get(controllerRef.Name)
 
 		if err != nil && ss == nil {

cluster-autoscaler/simulator/drainability/rules/replicacount/rule_test.go

@@ -243,6 +243,30 @@ func TestDrainable(t *testing.T) {
 			wantReason: drain.ControllerNotFound,
 			wantError:  true,
 		},
+		"SS-managed pod by a custom API Group": {
+			pod: &apiv1.Pod{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:            "bar",
+					Namespace:       "default",
+					OwnerReferences: test.GenerateOwnerReferences(statefulset.Name, "StatefulSet", "kruise/v1", ""),
+				},
+				Spec: apiv1.PodSpec{
+					NodeName: "node",
+				},
+			},
+		},
+		"SS-managed pod by a custom API Group with missing reference": {
+			pod: &apiv1.Pod{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:            "bar",
+					Namespace:       "default",
+					OwnerReferences: test.GenerateOwnerReferences("missing", "StatefulSet", "kruise/v1", ""),
+				},
+				Spec: apiv1.PodSpec{
+					NodeName: "node",
+				},
+			},
+		},
 		"RS-managed pod": {
 			pod: &apiv1.Pod{
 				ObjectMeta: metav1.ObjectMeta{