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

Build failed. - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/fee13b432290477488a9cae87ae8eb54 : SUCCESS in 6m 20s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/dabd48e234f94e1887f1e30b62a466c0 : FAILURE in 4m 47s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/0e0c8cb048244d6ea410ac673d4d90c9 : FAILURE in 5m 49s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/a3684709294f4a7b90a2751a610d8262 : FAILURE in 5m 44s