[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/5192fe26268e42909923489d8b9268... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/6efe528c68b34267be9406df74656c63 : SUCCESS in 3m 07s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/b589d0733d6d42e3a7fda28dfaf3d8c7 : FAILURE in 2m 48s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/0243ff733ea5437eaebdd942321192d5 : SUCCESS in 3m 01s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/f80ee015051f4686bce9c21b5a2746bc : FAILURE in 2m 43s