[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/77ecaec4f328468db9075ac479c0a1... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/f2210519fb534d44a90261e28898bd4c : SUCCESS in 3m 10s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/3da781673d59463a94a2ac64016a70dd : RETRY_LIMIT in 2m 30s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/98ad8f01e76c4accbdf1c1c379327bd5 : SUCCESS in 2m 28s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/98bb6b8fdf6d4a16ad8d47582daef603 : FAILURE in 2m 51s