code: func NewCronJobInformer(client kubernetes.Interface, namespace string, resyncPeriod time.Duration, indexers cache.Indexers) cache.SharedIndexInformer {
  	return NewFilteredCronJobInformer(client, namespace, resyncPeriod, indexers, nil)
  }
docs: // NewCronJobInformer constructs a new informer for CronJob type.
  // Always prefer using an informer factory to get a shared informer instead of getting an independent
  // one. This reduces memory footprint and number of connections to the server.