[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/94c33276d15445d2825841c7e1cb3db3 : SUCCESS in 6m 27s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/42d637e8920b4499b070fa8b40e43809 : FAILURE in 4m 14s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/369828a30e4f4735afd3b0ca9ed8831b : FAILURE in 7m 50s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/3274e28b89634a4092ede844dc75d069 : FAILURE in 6m 40s