[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/8708a2a44de14905adc7d494a9bfbe7b : SUCCESS in 9m 24s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/a988b590df8c4dec9a1a88a444a9017d : FAILURE in 7m 52s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/4969414d44bd4acf90d119b6103ad9c9 : FAILURE in 8m 57s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/ca993a05f67b4cc19796fef65e86dad4 : FAILURE in 10m 10s