code: func (s *ServiceController) processServiceDeletion(key string) error {
  	cachedService, ok := s.cache.get(key)
  	if !ok {
  		klog.Errorf("service %s not in cache even though the watcher thought it was. Ignoring the deletion", key)
  		return nil
  	}
  	return s.processLoadBalancerDelete(cachedService, key)
  }
docs: // Returns an error if processing the service deletion failed, along with a time.Duration
  // indicating whether processing should be retried; zero means no-retry; otherwise
  // we should retry after that Duration.