[
    {
      "description": "Name of the Prometheus metric",
      "mode": "NULLABLE",
      "name": "metricname",
      "type": "STRING"
    },
    {
      "description": "Prometheus metrics labels stored as JSON string",
      "mode": "NULLABLE",
      "name": "tags",
      "type": "STRING"
    },
    {
      "description": "Prometheus metrics timestamp",
      "mode": "NULLABLE",
      "name": "timestamp",
      "type": "TIMESTAMP"
    },
    {
        "description": "Value of the Prometheus metric",
        "mode": "NULLABLE",
        "name": "value",
        "type": "FLOAT"
      }
  ]