[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/c842d9bdf75b4875897503a8c2a251... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/87c24cb9dd574e2da5a42165827de302 : SUCCESS in 3m 13s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/e51b426f3c1f40d2b3716db600cbe255 : FAILURE in 2m 25s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/a1c0272a141f4e3790ffd35ad6716c96 : SUCCESS in 2m 46s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/74dcfac15e12481f98193c6d639fdf29 : FAILURE in 2m 49s