[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/7f348c198163497b801004a5ae5856... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/cc50237f63e74770914ae199b959ea62 : SUCCESS in 4m 06s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/271b3009a07b440a85ba351788f82efc : FAILURE in 3m 26s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/d1b32421a49b4a0f8d931f4ceca2d600 : SUCCESS in 5m 29s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/7b263d01f8664dc69db390bd46cf1541 : FAILURE in 2m 57s