[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/cc14a4ff3fbf426fb2c72b42d770eb... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/e51c87dc366f449a85bce4b3f12e082a : SUCCESS in 3m 16s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/dc806d474c8d4bcfbbfb059f1c785c6c : FAILURE in 3m 16s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/916786dd48f84896bbee4fc8862a821c : SUCCESS in 3m 20s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/a406d2230fb44e7b98c02556ff0e5444 : FAILURE in 3m 12s