[Openstack-stable-maint] Stable check of openstack/oslo.middleware for ref refs/heads/stable/train failed

Build failed. https://zuul.opendev.org/t/openstack/buildset/4b9c39d9eaa74be69863e366acd50c... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/154025609cc14e8d9ae5a479aabc8f54 : SUCCESS in 3m 41s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/61ee656313ac410e80703a6af61643d3 : FAILURE in 4m 23s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/0f870ed233fc44c49fa46ccbcde9c056 : SUCCESS in 5m 04s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/c51b144fb1d045ce90aa0b2447c95e29 : FAILURE in 3m 55s