code: func (s *APIServer) getAuthServers(auth ClientI, w http.ResponseWriter, r *http.Request, p httprouter.Params, version string) (interface{}, error) {
  	servers, err := auth.GetAuthServers()
  	if err != nil {
  		return nil, trace.Wrap(err)
  	}
  	return marshalServers(servers, version)
  }
docs: // getAuthServers returns registered auth servers