[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/66a176fabc6c4a9dba019d32c96323... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/b166dc61b0af40bfbec3106be2965042 : SUCCESS in 7m 18s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/0bbc0e0fb77c454d839c08542c779229 : FAILURE in 2m 53s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/57817fc29133452093000e99b91dfdab : SUCCESS in 3m 24s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/838bed14a4934bc38e3c018255e138fa : FAILURE in 2m 51s