help you fix your problem I revisited this open bug and found my answer: This was an Out of Memory error on my instance. Turns out the recursive downloading of profiles had reached 1.25GB of RAM and the instance shut down each time. After ruling out TIMEDOUT requests with logging, I then went to the app engine console and found this telling graph:
I hope this helps . ReadinessProbe - is the app ready to handle requests? Use a health check to check if the app is ready to handle new requests. This can be implemented in /actuator/health. Also see StartupProbe below.