[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/093c10fb5fd643dcaaa90129b062c6... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/ecb7465fcb8745cd8057ec19f588e7c1 : SUCCESS in 3m 28s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/29fdb6b7019d43e198ce02c65471a73b : FAILURE in 3m 01s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/932fca0f9995460dadec1fdfe7643c2b : SUCCESS in 3m 46s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/4038f4eb61254038bd9e026f9f4314c6 : FAILURE in 2m 55s