在Google App Engine上进行持续集成/部署/交付是否太冒险了？

我们最近在Google App Engine上设置了Node.js Web应用程序的持续集成/部署/交付。CI服务器（GitLabCI）根据分支（开发/母版）运行依赖项安装，构建，测试和部署到集成/产品。

在今天，我们面临的唯一错误是在依赖步骤中，因此我们对此并不在意。但是昨天（16/10/16），发生了大规模的DNS中断，并且在部署步骤的中间，管道发生故障，从而破坏了产品。只需重新运行管道就可以完成工作，但是问题可以随时重现。

我的问题是：

• 在持续部署过程中，我们如何处理此类网络问题？
• 在Google App Engine上进行持续部署真的是一个好主意吗？
• 如果是，那么App Engine部署方法是什么？我找不到任何相关的文档...

目前，我们只有两个版本“ dev”和“ prod”在提交后进行了更新，但是在随机时间，我可以观察到奇怪的行为。

任何回应/建议/反馈都非常欢迎！

关于我正在谈论的网络问题的stacktrace示例：

DEBUG: Error sending result: 'MetadataServerException(HTTPError(),)'. Reason: 'PicklingError("Can't pickle <type 'cStringIO.StringO'>: attribute lookup cStringIO.StringO failed",)'
Traceback (most recent call last):
  File "/google-cloud-sdk/lib/googlecloudsdk/calliope/cli.py", line 733, in Execute
    resources = args.calliope_command.Run(cli=self, args=args)
  File "/google-cloud-sdk/lib/googlecloudsdk/calliope/backend.py", line 1630, in Run
    resources = command_instance.Run(args)
  File "/google-cloud-sdk/lib/surface/app/deploy.py", line 53, in Run
    return deploy_util.RunDeploy(self, args)
  File "/google-cloud-sdk/lib/googlecloudsdk/command_lib/app/deploy_util.py", line 387, in RunDeploy
    all_services)
  File "/google-cloud-sdk/lib/googlecloudsdk/command_lib/app/deploy_util.py", line 247, in Deploy
    manifest = _UploadFiles(service, code_bucket_ref)
  File "/google-cloud-sdk/lib/googlecloudsdk/command_lib/app/deploy_util.py", line 115, in _UploadFiles
    service, code_bucket_ref)
  File "/google-cloud-sdk/lib/googlecloudsdk/api_lib/app/deploy_app_command_util.py", line 277, in CopyFilesToCodeBucketNoGsUtil
    _UploadFiles(files_to_upload, bucket_ref)
  File "/google-cloud-sdk/lib/googlecloudsdk/api_lib/app/deploy_app_command_util.py", line 219, in _UploadFiles
    results = pool.map(_UploadFile, tasks)
  File "/usr/lib/python2.7/multiprocessing/pool.py", line 251, in map
    return self.map_async(func, iterable, chunksize).get()
  File "/usr/lib/python2.7/multiprocessing/pool.py", line 558, in get
    raise self._value
MaybeEncodingError: Error sending result: 'MetadataServerException(HTTPError(),)'. Reason: 'PicklingError("Can't pickle <type 'cStringIO.StringO'>: attribute lookup cStringIO.StringO failed",)'
DEBUG: Exception captured in Error
Traceback (most recent call last):
  File "/google-cloud-sdk/lib/googlecloudsdk/core/metrics.py", line 411, in Wrapper
    return func(*args, **kwds)
TypeError: Error() takes exactly 3 arguments (1 given)
ERROR: gcloud crashed (MaybeEncodingError): Error sending result: 'MetadataServerException(HTTPError(),)'. Reason: 'PicklingError("Can't pickle <type 'cStringIO.StringO'>: attribute lookup cStringIO.StringO failed",)'
Traceback (most recent call last):
  File "/google-cloud-sdk/lib/gcloud.py", line 65, in <module>
    main()
  File "/google-cloud-sdk/lib/gcloud.py", line 61, in main
    sys.exit(googlecloudsdk.gcloud_main.main())
  File "/google-cloud-sdk/lib/googlecloudsdk/gcloud_main.py", line 145, in main
    crash_handling.HandleGcloudCrash(err)
  File "/google-cloud-sdk/lib/googlecloudsdk/command_lib/crash_handling.py", line 107, in HandleGcloudCrash
    _ReportError(err)
  File "/google-cloud-sdk/lib/googlecloudsdk/command_lib/crash_handling.py", line 86, in _ReportError
    util.ErrorReporting().ReportEvent(error_message=stacktrace,
  File "/google-cloud-sdk/lib/googlecloudsdk/api_lib/error_reporting/util.py", line 28, in __init__
    self._API_NAME, self._API_VERSION)
  File "/google-cloud-sdk/lib/googlecloudsdk/core/apis.py", line 254, in GetClientInstance
    http_client = http.Http()
  File "/google-cloud-sdk/lib/googlecloudsdk/core/credentials/http.py", line 60, in Http
    creds = store.Load()
  File "/google-cloud-sdk/lib/googlecloudsdk/core/credentials/store.py", line 282, in Load
    if account in c_gce.Metadata().Accounts():
  File "/google-cloud-sdk/lib/googlecloudsdk/core/credentials/gce.py", line 122, in Accounts
    gce_read.GOOGLE_GCE_METADATA_ACCOUNTS_URI + '/')
  File "/google-cloud-sdk/lib/googlecloudsdk/core/util/retry.py", line 160, in TryFunc
    return func(*args, **kwargs), None
  File "/google-cloud-sdk/lib/googlecloudsdk/core/credentials/gce.py", line 45, in _ReadNoProxyWithCleanFailures
    raise MetadataServerException(e)
googlecloudsdk.core.credentials.gce.MetadataServerException: HTTP Error 503: Service Unavailable
DEBUG: Uploading [/builds/apps/webapp/lib/jinja2/defaults.pyc] to [151c77b4e5bdd2c38b6a2bf914fffa3a6ffa71a6]
INFO: Uploading [/builds/apps/webapp/lib/jinja2/defaults.pyc] to [151c77b4e5bdd2c38b6a2bf914fffa3a6ffa71a6]
INFO: Refreshing access_token