[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/6581cb4fe2144d0cb68a8a1126daa1... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/27df4113be8e4ab18699600d448357d7 : SUCCESS in 2m 47s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/61aee107daca406f93a772875c905b6b : FAILURE in 3m 10s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/5ecfc536e5a74f6ebeb4754d58c43974 : SUCCESS in 3m 20s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/7aaf6d06396e492ba9a2708764a6bbba : FAILURE in 2m 41s