[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/6587a4e070d0464888917a31f38f17... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/e926d5c96f1e4589be4c8407af2ac863 : SUCCESS in 3m 30s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/54bef7dd545141cdb43999c16c9fd0e7 : SUCCESS in 6m 08s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/e1bd3e7721b44b1787fed10bb05da047 : SUCCESS in 5m 07s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/27b58c5dd58c4adb85211dc43ca09ab6 : FAILURE in 4m 19s