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

Build failed. https://zuul.opendev.org/t/openstack/buildset/8d7c274db1a14dbc9cc22aa192cf61... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/22bb1ac9f77d412ea43c7bbfd7629755 : FAILURE in 4m 45s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/c765be07c13c4e508899fa09fdcf25ed : SUCCESS in 5m 31s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/de72bd15a7e242f6b07ec841ff7c063b : SUCCESS in 5m 23s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/031fe91c8f884a7aabb0a28d958d66b1 : SUCCESS in 6m 03s