Let us keep in mind this workaround Erno talked about:
"Due to eventlet bug, glance-api won't be able to terminate ssl/tsl connections anymore, so if we need to have encryption on the network all the way to the node we will need to deploy stunnel or something similar in front and make glance just listening localhost".
This will require documentation.
I have tested all glance api's with python 3 enabled using devstack setup, everything is working as expected. We just need to keep in mind about evetnlet issue and workaround mention in comment #4.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHEA-2019:2811