[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/380606db8e38483ebac6b19bd8abb8... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/543c6caced794c44ae79d7842919bb92 : SUCCESS in 2m 44s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/2caf0a14dcbd4e0db1e6f22fad2d8f23 : FAILURE in 2m 55s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/9d88a4bd91c842318a919c66a663de37 : SUCCESS in 2m 34s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/c78b76fe6b1e4d53b965506031b1f3ca : FAILURE in 2m 43s