{
  "version": "0.0.1",
  "metric_definitions": [
    {
      "id": 1,
      "name": "object count",
      "description": "count number of objects observed",
      "spec": [
        {"label_id": 27, "label_name": "car"},
        {"label_id": 34, "label_name": "bicycle"},
        {"label_id": 25, "label_name": "person"}
      ]
    }
  ]
}