[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/4659b398121a47348b5e0a8f678f23... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/cb0a1e7ca2db4be6822241cba992ed8a : SUCCESS in 2m 53s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/bac8dd10c0294bcabb0a22946bb5c3ac : FAILURE in 2m 57s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/9c883e02086b4eb0b0902272aa46d8bd : SUCCESS in 2m 45s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/b18cb5b79e3e48a7afac912e40dd336c : FAILURE in 3m 20s