[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/0ba029716f0a41d4a38aa850487f72... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/dc2e8539559547a8a293696f55dba8d8 : SUCCESS in 3m 47s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/6389ca95a2c546f890129cebff13587c : FAILURE in 4m 51s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/8faa749898814a44ab6b08501e3fdd01 : SUCCESS in 3m 17s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/87d4fde7a44b4ab0afc99d8d121eaa26 : FAILURE in 3m 15s