[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/92806e06991144b8a14ccf4f31163d... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/64074dc40c8248dfa9049e0dc1313de0 : SUCCESS in 5m 03s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/e12307cf496c4eaca1bd5286443e1ae1 : FAILURE in 2m 46s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/d5e78cdb899b4075993e469f699b6c0e : SUCCESS in 2m 52s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/13d982da249a4226ae2e1dca64049b7f : FAILURE in 3m 38s