[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/84d434df455749a784a4f270a598df26 : SUCCESS in 5m 09s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/618f1c49753e4da2a70952023b19f705 : FAILURE in 4m 48s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/c00e6fbd2eda459c86e4d646bb52fdbb : FAILURE in 5m 17s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/06d50673b3824bec98bc4650516916ff : FAILURE in 5m 27s