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

Build failed. https://zuul.opendev.org/t/openstack/buildset/d86fc041337249e8bf94b0c4941edd... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/ad78f314f6e845ef8ba5a71f244c15c6 : SUCCESS in 7m 13s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/63740cfb8bfe4194a083661330be94ee : FAILURE in 6m 25s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/b0fc72a2ff454c31bae14614d5db855e : SUCCESS in 5m 31s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/a65d452452244337b53fcfa6c06dd192 : SUCCESS in 6m 29s