[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/4401c71f9d0c4c3093e43d9b5aa927... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/f31b7666e32d4cd6912358dedd67733f : SUCCESS in 3m 22s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/1f130be4f8b142049db158cd26bbf5c1 : FAILURE in 3m 27s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/bc971b0b0dc343cb9db27f9a869d0cfb : SUCCESS in 3m 12s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/ad7ee0a853594ca0b0c32080f744cea5 : FAILURE in 3m 59s