[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/2c7eca428efe4af28d0e971f94af37... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/220da148598e44aab0efe7e301eb6e44 : SUCCESS in 3m 12s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/3b25ec7c186048908f3ddab19d62c2d3 : FAILURE in 4m 18s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/5eeea6fbd8fa4df59063bc32ebb8ddb6 : SUCCESS in 2m 59s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/c60c8f9a57c64952bb1a1651811d2481 : FAILURE in 2m 47s