[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/a66b39ac719043b4933660a288b226... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/eed020c4ddfe492d96cddd888129c830 : SUCCESS in 3m 10s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/d954409e46dc483894fbd0e281b10c77 : RETRY_LIMIT in 3m 31s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/3fcef74cc66a4d6ca80553f7f856193e : SUCCESS in 2m 59s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/32ad103b9574402abf460899c21ce504 : SUCCESS in 3m 47s