[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/2f44853f0348497b9947f1aee74665... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/22d4699ccd2540cbbdf7dfe229a819ac : SUCCESS in 3m 29s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/b94a1f35e49140239b97d76dddf52e0a : FAILURE in 3m 43s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/8842d194f83b47088bb534095d266395 : SUCCESS in 3m 51s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/f8a5aecef37a41779ba72f885853c705 : FAILURE in 3m 36s