code: func NewClusterRoleInformer(client kubernetes.Interface, resyncPeriod time.Duration, indexers cache.Indexers) cache.SharedIndexInformer {
  	return NewFilteredClusterRoleInformer(client, resyncPeriod, indexers, nil)
  }
docs: // NewClusterRoleInformer constructs a new informer for ClusterRole 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.