[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/544794396cec4210b6d3065f928908... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/a37ad10504e346af864452e46d724903 : SUCCESS in 2m 39s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/d6207494d5524a7f9463eeaacd1e1212 : FAILURE in 2m 49s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/9984c84297cb46679a1ac931e0514b95 : SUCCESS in 2m 43s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/8d9f244e20d24dc9815d5a03a8298721 : FAILURE in 2m 28s