[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/d2abe1f64f854bbc9b85611dd0e78c... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/f1a37bdf306d4e348552f14612f82b32 : SUCCESS in 4m 49s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/48a5138bf2f0440ba3b8383b250e6f12 : FAILURE in 3m 03s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/d5cbcd87039448688c1651eff4aacd24 : SUCCESS in 3m 30s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/e46677b6106e4199bc46e1bf0fc6a844 : FAILURE in 3m 10s