[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/cbc1426500094f29bf13e5e85a2a3e... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/d9662bf5212b4eaba9688aa65e33d017 : SUCCESS in 8m 13s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/4e79dfd6a8bc445a81f9d5eac9291fb7 : SUCCESS in 3m 53s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/348aacf054764387a495ef5867ffbcb6 : SUCCESS in 3m 43s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/4fc77350cbea41b692743cc5586a2b34 : FAILURE in 3m 49s