diagnostic.json

{
  "header": {
    "stamp": {
      "sec": 123,
      "nsec": 123,
    },
    "frame_id": "",
    "seq": 0,
  },
  "status": [{
    "level": 0,
    "name": "some name",
    "message": "some message",
    "hardware_id": "some id",
    "values": [{ "key": "foo", "value": "bar" }],
  }],
}