[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/5d04b302239a41cbae6e201d7c425f... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/e8df011021d44f65b3796fbb854530fc : SUCCESS in 5m 04s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/704bb79fa3584390828a8be3ecdeb7ad : FAILURE in 3m 16s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/69c5a7838b12492596b84a64c3ab0946 : SUCCESS in 5m 27s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/1d1392943ccf4332a1a3a74cc9a753ff : FAILURE in 3m 28s