[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/9069aede7fab4dd2a87105a45cd784... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/7ac75727e6af4823a0e7b1f9d5b1aa17 : SUCCESS in 4m 24s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/24af4ac4802d41d8ac274d94c2fffb12 : FAILURE in 3m 43s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/563de19ba2174ea1b105830677ae84c8 : SUCCESS in 4m 02s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/75eeef1c29244049be543a2692523754 : FAILURE in 3m 31s