Hi,
GAE Flex Python (3.6) deploys using default container are failing.
Yesterday deployments where fine.
Suggested solution in SO post - pin google-api-core==1.17.0 - is working. Probably new google-api-core broke something.
This is the 2nd occasion in a few months where Python flex users have to work around google low-level api issues. This environment is not getting the TLC it should.