[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/f49af4dd11bb448c9da86f8cf70486... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/dffe0090aa8448f2b9aa560670744d45 : SUCCESS in 4m 51s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/5532c0663ea948699b254422186af2e0 : FAILURE in 2m 57s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/7255ee8cbaed46278dc1e7803f4122ea : SUCCESS in 2m 43s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/a9a79a6d024f41148329cc00640290ec : FAILURE in 2m 37s