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

Build failed. - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/214692647ba0406c8609ee7628b4b742 : SUCCESS in 11m 30s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/962b5727b4944d3fb69cf47d5f588383 : FAILURE in 11m 20s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/8168a4796ebc49319363d060b78f8ddb : SUCCESS in 11m 46s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/a55ba3b3bd424c17bc47c709e76a7e11 : SUCCESS in 12m 32s