code: func (u *UIDTrackingControllerExpectations) DeletionObserved(rcKey, deleteKey string) {
  	u.uidStoreLock.Lock()
  	defer u.uidStoreLock.Unlock()
  
  	uids := u.GetUIDs(rcKey)
  	if uids != nil && uids.Has(deleteKey) {
  		klog.V(4).Infof("Controller %v received delete for pod %v", rcKey, deleteKey)
  		u.ControllerExpectationsInterface.DeletionObserved(rcKey)
  		uids.Delete(deleteKey)
  	}
  }
docs: // DeletionObserved records the given deleteKey as a deletion, for the given rc.