[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/f37ba1a016e045459bf17209d64c18... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/dcbbe1ca7f8746be9da725094bd4a284 : SUCCESS in 2m 52s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/1cb2d044cc1c47cb8f9ff12dbc5ce99d : FAILURE in 4m 18s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/a3963c19e2414804bb7731726dc216a5 : SUCCESS in 3m 02s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/e69b118ffb60450693a7de267b336cd4 : FAILURE in 3m 08s