json_schema: {
      "additionalProperties": false,
      "properties": {
          "attributes": {
              "type": [
                  "object",
                  "null"
              ]
          },
          "cpuPlatform": {
              "maxLength": 64,
              "type": "string"
          },
          "hostname": {
              "_format": "hostname",
              "maxLength": 255,
              "type": "string"
          },
          "id": {
              "maxLength": 32,
              "type": "string"
          },
          "image": {
              "maxLength": 128,
              "type": "string"
          },
          "machineType": {
              "maxLength": 64,
              "type": "string"
          },
          "name": {
              "maxLength": 64,
              "type": "string"
          },
          "tags": {
              "items": {
                  "type": "string"
              },
              "type": [
                  "array",
                  "null"
              ]
          },
          "zone": {
              "maxLength": 64,
              "type": "string"
          }
      },
      "required": [
          "cpuPlatform",
          "hostname",
          "id",
          "image",
          "machineType",
          "name",
          "zone",
          "attributes",
          "tags"
      ],
      "self": {
          "format": "jsonschema",
          "name": "instance_metadata",
          "vendor": "com.google.cloud.gce",
          "version": "1-0-0"
      },
      "type": "object"
  }