code: func (s *PresenceService) GetNamespace(name string) (*services.Namespace, error) {
  	if name == "" {
  		return nil, trace.BadParameter("missing namespace name")
  	}
  	item, err := s.Get(context.TODO(), backend.Key(namespacesPrefix, name, paramsPrefix))
  	if err != nil {
  		if trace.IsNotFound(err) {
  			return nil, trace.NotFound("namespace %q is not found", name)
  		}
  		return nil, trace.Wrap(err)
  	}
  	return services.UnmarshalNamespace(
  		item.Value, services.WithResourceID(item.ID), services.WithExpires(item.Expires))
  }
docs: // GetNamespace returns a namespace by name