Hi, we have a python app using App Engine Flexible, and for some reason, it 
just started throwing 503 errors and failing. 

There was no spike in traffic and this version had been deployed for the 
last 6 days with no issues. Basically, nothing changed. 

We tried to let the version self-heal, but it wasn't working. The version 
entered a loop where it would start and then shutdown continuously.

Finally, I gave up and deployed a fresh version, which works as expected.

Can someone help explain why this might have happened and how to prevent it 
in the future?


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