code: func (rq *ResourceQuotaController) enqueueResourceQuota(obj interface{}) {
  	key, err := controller.KeyFunc(obj)
  	if err != nil {
  		klog.Errorf("Couldn't get key for object %+v: %v", obj, err)
  		return
  	}
  	rq.queue.Add(key)
  }
docs: // obj could be an *v1.ResourceQuota, or a DeletionFinalStateUnknown marker item.