code: func (c *Cache) GetClusterName(opts ...services.MarshalOption) (services.ClusterName, error) {
  	clusterName, err := c.clusterConfigCache.GetClusterName(services.AddOptions(opts, services.SkipValidation())...)
  	if trace.IsNotFound(err) {
  		return c.ClusterConfig.GetClusterName(opts...)
  	}
  	return clusterName, err
  }
docs: // GetClusterName gets the name of the cluster from the backend.