code: func (s *ClusterConfigurationService) GetClusterName(opts ...services.MarshalOption) (services.ClusterName, error) {
  	item, err := s.Get(context.TODO(), backend.Key(clusterConfigPrefix, namePrefix))
  	if err != nil {
  		if trace.IsNotFound(err) {
  			return nil, trace.NotFound("cluster name not found")
  		}
  		return nil, trace.Wrap(err)
  	}
  	return services.GetClusterNameMarshaler().Unmarshal(item.Value,
  		services.AddOptions(opts, services.WithResourceID(item.ID))...)
  }
docs: // GetClusterName gets the name of the cluster from the backend.