[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/c9917e7f259f4b8a833571823e94fb... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/00c0a034364e4d79b2bd38bbb78d077a : SUCCESS in 3m 51s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/9705acdadae548dfa55cafdc97bb0002 : SUCCESS in 3m 48s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/eb285362b60941108142dc6347a057db : SUCCESS in 3m 11s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/45c95abe0f4c4bbfa991bb00ca80780c : FAILURE in 4m 04s