code: func (*Service) ListPhysicalHosts(c context.Context, req *crimson.ListPhysicalHostsRequest) (*crimson.ListPhysicalHostsResponse, error) {
  	hosts, err := listPhysicalHosts(c, database.Get(c), req)
  	if err != nil {
  		return nil, err
  	}
  	return &crimson.ListPhysicalHostsResponse{
  		Hosts: hosts,
  	}, nil
  }
docs: // ListPhysicalHosts handles a request to list physical hosts.