[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/5e2550a4380a4d4db4d8a07257da64... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/18e61c33fc8a45569fc12eda64adea5c : SUCCESS in 4m 12s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/2cc4582cc45e408084af85b665241bf2 : FAILURE in 3m 09s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/26750aa6ff5749098d91d0eab502e540 : SUCCESS in 2m 34s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/456a24af76d4412f90dbccb1064d792e : FAILURE in 4m 24s