[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/dfc4158ce32e4d6982745a51d34203a4 : SUCCESS in 6m 04s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/6313b3014bd14d50b6e1551aec32ad85 : FAILURE in 4m 36s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/aecbd03145a5432a983a0ccb286f0056 : SUCCESS in 5m 27s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/b8c00417402642b3b9ba84e5943aeee7 : SUCCESS in 6m 37s