json_schema: {
      "additionalProperties": false,
      "description": "Schema for a Google Analytics screenview hit",
      "properties": {
          "screenName": {
              "maxLength": 2048,
              "type": "string"
          }
      },
      "required": [
          "screenName"
      ],
      "self": {
          "format": "jsonschema",
          "name": "screen_view",
          "vendor": "com.google.analytics.measurement-protocol",
          "version": "1-0-0"
      },
      "type": "object"
  }