// the Data field. ControllerRevisions may, however, be deleted. Note that, due to its use by both
// the DaemonSet and StatefulSet controllers for update and rollback, this object is beta. However,
// it may be subject to name and representation changes in future releases, and clients should not
// depend on its stability. It is primarily for internal use by controllers.
type ControllerRevision struct {
	metav1.TypeMeta `json:",inline"`

// updateHistory figures out what DaemonSet(s) manage a ControllerRevision when the ControllerRevision
// is updated and wake them up. If anything of the ControllerRevision has changed, we need to  awaken
// both the old and new DaemonSets.
func (dsc *DaemonSetsController) updateHistory(logger klog.Logger, old, cur interface{}) {
	curHistory := cur.(*apps.ControllerRevision)
	oldHistory := old.(*apps.ControllerRevision)