The message is "TimeoutSec should be less than checkIntervalSec", so it looks like an issue with your health check configuration in your app.yaml file <https://cloud.google.com/appengine/docs/flexible/python/reference/app-yaml#updated_health_checks> .
If the timeout value is less than the interval, then you might be affected by this known issue <https://issuetracker.google.com/36024384>. I recommend starring it to receive updates and see this Stackoverflow post <https://stackoverflow.com/questions/42886929/deploying-to-google-app-engine-does-not-work-due-to-health-check-interval-even-t> for a possible workaround. If you are still having issues, you can also create a new issue on the Issue Tracker to possibly have the App Engine Team investigate. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to google-appengine@googlegroups.com. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/d3793958-d33b-4ddd-b39f-a8c8fc3a184f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
