[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/66778c53fe484f8187cb6e6fd06370... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/dab8d31cbec6478989dce038325205f0 : SUCCESS in 6m 27s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/a11853bf72ae4b279461033931a109ba : SUCCESS in 4m 22s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/037eed90548349c788054ee203722075 : SUCCESS in 3m 42s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/066f2ae10bbd4916933967e5d1410265 : FAILURE in 3m 31s