[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/2ca93acae1da481c9baeb166531a4c... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/a1b0a7404b8f45eabbbe0905bc635bea : SUCCESS in 3m 49s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/569a4d4184874792b42df00fff51f25d : FAILURE in 2m 54s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/f46bffa59eac48bdb526e83b7b798454 : SUCCESS in 2m 50s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/b4a937fedbe34658938ec09b36d3e5d9 : FAILURE in 3m 24s