[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/8774a992d3f3487ba35435f98dc37c... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/69645ef5457f4cf3899bf01b932f2f7b : SUCCESS in 3m 06s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/d2fbb7a3a1e14d0d9d4abd4ae1e25c2d : FAILURE in 3m 08s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/cd28e7f81b124e40a3cbc367e9a04c42 : SUCCESS in 2m 59s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/f4e42e96e9a34137bb70813a790c160f : FAILURE in 2m 36s