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

Build failed. https://zuul.opendev.org/t/openstack/buildset/51dfcacdec284b86b7a4d011dccf41... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/02e92663069d4b729540282980a55a2c : SUCCESS in 6m 48s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/096163bd0f2a4ccfbde016bf00a67dc7 : FAILURE in 5m 55s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/70934a34e2004869967b15d31347f95a : SUCCESS in 5m 15s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/83da373e4810499585fe2e3a6700ce92 : SUCCESS in 6m 05s