[Openstack-stable-maint] Stable check of openstack/oslo.messaging for ref refs/heads/stable/train failed

Build failed. https://zuul.opendev.org/t/openstack/buildset/269041c8e07346b6aa97bf43f46a47... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/13d3fb24dd8842b895e4720abfca7f80 : SUCCESS in 4m 47s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/ef0ccf11abf04617afca7c219c5e3103 : SUCCESS in 6m 16s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/a9f75fe53ac6431bbdfba12eeb9d432f : SUCCESS in 4m 40s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/8329db36f2c84d319567ad7c90031bcd : FAILURE in 5m 50s