Thanks for reporting this. There was a known issue <https://status.cloud.google.com/incident/cloud-networking/19016>which occurred the same time that may be related to your issue which has since been resolved. Are you still experiencing the issue as it may be possible that there are no instances if your app.yaml is configured to automatic scaling <https://cloud.google.com/appengine/docs/standard/python/config/appref#automatic_scaling> and no minimum number of instances defined. If this is not the case please file an issue tracker for private App Engine <https://issuetracker.google.com/issues/new?component=491299&template=1161102> issues with the time frame the issue began, your project ID and the affected service/version so we can determine the cause of the 502 errors.
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