[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/ccc0911e46df46c89ba888332206cdce : SUCCESS in 8m 51s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/3cf3bd2264db4677a46989eb9340a090 : FAILURE in 7m 34s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/72f18cb37874452581bee946d4841c2e : FAILURE in 7m 50s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/9a8f3df0743646d7b0f8c0fdce9664f1 : FAILURE in 8m 12s