GAE Standard with Go: "The request failed because the instance failed the readiness check."

Google Cloud Serverless Applications
1

GAE Standard Environment with Go: App will not start.

The app was working and now its not. Dead in the water with no clues as to why, as far as I can see.

From the logs this is the error: “The request failed because the instance failed the readiness check.”

This is not due to a new deployment.

There is no mention of this error in the troubleshooting guide:

https://cloud.google.com/appengine/docs/standard/troubleshooting

I can not find any help on this problem.

Please, how do I go about finding the cause of this error?

2

I guess the lack of response means that there is no way to troubleshoot this problem?

Do Google employees monitor this forum?

3

Hi, I’ve faced almost same issue that app terminated. But in my case, I deployed a updated app that includes modified go.mod/go.sum with updated protobuf module - google.golang.org/protobuf - Go Packages. Protbuf lib causes ‘panic: proto: message appengine.AppIdentityServiceError is already registered’ that led ‘The request failed because the instance failed the readiness check.’ error.

Error log contains 'See (URL Removed by Staff) so I fixed for now add following directive in app.yaml file:

env_variables:
  GOLANG_PROTOBUF_REGISTRATION_CONFLICT: "warn"

This outputs many warning like follows when booted up, but app working.

WARNING: proto: file “google.golang.org/appengine/internal/datastore/datastore_v3.proto” has a name conflict over appengine.AddActionsRequest
See https://protobuf.dev/reference/go/faq#namespace-conflict
WARNING: proto: file “google.golang.org/appengine/internal/datastore/datastore_v3.proto” has a name conflict over appengine.CompositeIndices
See https://protobuf.dev/reference/go/faq#namespace-conflict