[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/e1c2fa3780f341829b8bb5b7a6c44c... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/6f7f16722c71410eba79d858c566834c : SUCCESS in 4m 13s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/0a78cd680c3c4d13ab1c1055b47339d6 : SUCCESS in 2m 47s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/92817aaac35342ab8746e614025298f5 : SUCCESS in 4m 30s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/2b50f6f123474a1f8f47b2c14deaa97b : FAILURE in 2m 48s