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

Build failed. https://zuul.opendev.org/t/openstack/buildset/992dfa311b684646b2dd1409e9c622... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/f8d89411e769484789271aa86c3e2864 : SUCCESS in 9m 49s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/380669bffce14538afe0efef3f9b95bc : SUCCESS in 4m 50s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/0187a3c8735242e386805e038cf3ebe3 : SUCCESS in 4m 13s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/572b2c9c7e364649b60f3a7ba374d78c : FAILURE in 3m 54s