json_schema: {
      "additionalProperties": false,
      "description": "Schema for an application foreground event",
      "properties": {
          "foregroundIndex": {
              "maximum": 2147483647,
              "minimum": 0,
              "type": "integer"
          }
      },
      "self": {
          "format": "jsonschema",
          "name": "application_foreground",
          "vendor": "com.snowplowanalytics.snowplow",
          "version": "1-0-0"
      },
      "type": "object"
  }