[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/4b2f7e2044634c3d906062bfcaa8d1... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/9dcc024ba9984a6c8f8bba4aacd23cba : SUCCESS in 4m 07s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/5968858bab6e4f6cb3a86bc7b7d32f97 : SUCCESS in 4m 15s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/7c45f59acdd14dcc9a956414308897d5 : SUCCESS in 4m 18s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/9612a39b54d14f3e968222c99627d673 : FAILURE in 5m 56s