[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/c4b145cc7fa14f5287ed6a1a80d782... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/4476ff5b07d5460692c77dc8f9d04317 : SUCCESS in 3m 18s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/6d7d4d2029fe41049f6415b9e3f53a3f : FAILURE in 4m 32s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/63413d88a26d4474b4f0400be45760f8 : SUCCESS in 2m 36s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/655151c496a34e9784bd0ec34df0eb27 : FAILURE in 3m 04s