[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/bfefe05f62a544878787bc5a7c5483... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/eb7987ba20904ef6a611cef40f524c0d : SUCCESS in 3m 20s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/3df44745a5df49e79b234e788da56038 : FAILURE in 3m 16s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/34fbf5dbdc6a44c69715d42fa83f256a : SUCCESS in 3m 20s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/90753cdb0ba0474c885bbc7430bb6828 : FAILURE in 3m 24s