func (dc *DisruptionController) getPodReplicaSet(ctx context.Context, controllerRef *metav1.OwnerReference, namespace string) (*controllerAndScale, error) {
	ok, err := verifyGroupKind(controllerRef, controllerKindRS.Kind, []string{"apps", "extensions"})
	if !ok || err != nil {
		return nil, err
	}
	rs, err := dc.rsLister.ReplicaSets(namespace).Get(controllerRef.Name)
	if err != nil {