[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/ab5131a5304a4d52b94ebf9651b153... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/82adc5d28543478081306fae7d84b139 : SUCCESS in 2m 57s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/f594b8c205124dd0933c703a4a1a3c14 : SUCCESS in 3m 30s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/ba6e4ae1873d463f8eaefc431e361975 : SUCCESS in 3m 55s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/58c59acdb89a4840a057b82811032526 : FAILURE in 4m 44s