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

Build failed. - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/fbfadc8c26e4468bb6ebda1e47e20e44 : SUCCESS in 7m 26s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/73173c8c7d6145f3aed09d0ec05c9f7c : FAILURE in 6m 46s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/92dda3c33aec43e280bca1e5529fe321 : SUCCESS in 5m 42s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/13e60685617f466a94d09811ddf55a67 : SUCCESS in 5m 54s