InfluxDB: Add custom metadata to first frame

[itsmylife]

What is this feature?

Some users use proxy between influxdb and grafana and want to return custom metadata to grafana frontend so that can be seen in "Query Inspector". We introduced "influx_response" field for this custom data. The data will be read and add to the first frame metadata field if it is present in the influxdb response.

Example JSON:

{
  "results": [
    {
      "series": [
        {
          "name": "cpu.upc",
          "columns": [
            "time",
            "mean",
            "sum"
          ],
          "tags": {
            "datacenter": "America",
            "dc.region.name": "Northeast",
            "cluster-name": "Cluster",
            "/cluster/name/": "Cluster/",
            "@cluster@name@": "Cluster@"
          },
          "values": [
            [
              111,
              222,
              333
            ]
          ]
        }
      ]
    }
  ],
  "influx_response": {
    "server": "some-server",
    "status": 200,
    "eggs": "over-easy"
  }
}

Why do we need this feature?

Providing some more flexibility for users wants to share custom metadata

Who is this feature for?

InfluxDB influxql users