code: func (s *PresenceService) GetTrustedCluster(name string) (services.TrustedCluster, error) {
  	if name == "" {
  		return nil, trace.BadParameter("missing trusted cluster name")
  	}
  	item, err := s.Get(context.TODO(), backend.Key(trustedClustersPrefix, name))
  	if err != nil {
  		return nil, trace.Wrap(err)
  	}
  	return services.GetTrustedClusterMarshaler().Unmarshal(item.Value, services.WithResourceID(item.ID), services.WithExpires(item.Expires))
  }
docs: // GetTrustedCluster returns a single TrustedCluster by name.