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Description
This could explain why gcloud app version stop <version> takes in the range of 20 minutes for ~16 VMs.
I'm not sure if this is done yet, from a quick scan of the code it doesn't seem like it.
Note. sigterm is documented in the appengine flex docs:
https://cloud.google.com/appengine/docs/flexible/custom-runtimes/build#handling_lifecycle_events