func newRevision(set *apps.StatefulSet, revision int64, collisionCount *int32) (*apps.ControllerRevision, error) {
	patch, err := getPatch(set)
	if err != nil {
		return nil, err
	}
	cr, err := history.NewControllerRevision(set,
		controllerKind,
		set.Spec.Template.Labels,
		runtime.RawExtension{Raw: patch},
		revision,
		collisionCount)
	if err != nil {
		return nil, err
	}
	if cr.ObjectMeta.Annotations == nil {