[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/c68cd57aa26d43419044a9ba739e2b... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/8db0c349c45b41408e3978b3c31c77a0 : SUCCESS in 3m 45s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/de5ec7bb07e94b1986b8a91b6373a070 : FAILURE in 2m 37s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/04ab38e080e141e4a9767e268af67737 : SUCCESS in 2m 51s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/5d286db261a148a482891080a7adc8db : FAILURE in 3m 01s