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

Build failed. https://zuul.opendev.org/t/openstack/buildset/05533e9f893c4552be516dd9d739d4... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/bc61f73c35a745acaad4569124cd7a15 : FAILURE in 4m 51s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/2456a34d8b774e9abccad67317f32543 : SUCCESS in 4m 44s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/88a4bf7fa9ab4e57b5ed8674548f9f67 : SUCCESS in 5m 49s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/4c1694c5711a467dbcff2b4da43b792b : SUCCESS in 5m 26s