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

Build failed. https://zuul.opendev.org/t/openstack/buildset/296062739b38490cbc4e9886002cbe... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/e06487960b8e4f1c9e4d6cb9e5a7dc4e : SUCCESS in 5m 28s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/96e059052a0a47609f0774da5c50fc1a : SUCCESS in 5m 51s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/62d4aa5a20044eeb97559b2a9c0e2535 : SUCCESS in 4m 29s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/87fc2eb519314cf4912aa443aa63848d : FAILURE in 3m 49s