code: def get(self):
      
      try:
        cluster = self.get_argument_cluster()
  
        role = self.get_argument_role()
        environ = self.get_argument_environ()
        topology_name = self.get_argument_topology()
        topology = self.tracker.getTopologyByClusterRoleEnvironAndName(
            cluster, role, environ, topology_name)
  
        start_time = self.get_argument_starttime()
        end_time = self.get_argument_endtime()
        self.validateInterval(start_time, end_time)
  
        query = self.get_argument_query()
        metrics = yield tornado.gen.Task(self.executeMetricsQuery,
                                         topology.tmaster, query, int(start_time), int(end_time))
        self.write_success_response(metrics)
      except Exception as e:
        Log.debug(traceback.format_exc())
        self.write_error_response(e)
docs: get method