Get a job's metrics

{
  "data": [
    {
      "metricGroups": [
        {
          "name": "bytes_recv",
          "subtasks": [
            {
              "index": 1,
              "metrics": [
                {
                  "time": 1,
                  "value": 123
                }
              ]
            }
          ]
        }
      ],
      "nodeId": 1
    }
  ]
}