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

Build failed. https://zuul.opendev.org/t/openstack/buildset/563bdefd68604cbbab360b350a221e... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/7505e1c638714fdd912506a7cb4d8334 : SUCCESS in 6m 53s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/e592bb53be964d5b829a70f460011136 : SUCCESS in 5m 12s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/30d180db934c44a08cb460e1ec1b4bdc : SUCCESS in 4m 33s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/f78a9c641342488180ffe752b17eb587 : FAILURE in 5m 01s