[Openstack-stable-maint] Stable check of openstack/oslo.middleware for ref refs/heads/stable/train failed

Build failed. https://zuul.opendev.org/t/openstack/buildset/d954af539a42443487c04924409125... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/713c4efca7dc4432b56314d55bbf309d : SUCCESS in 4m 08s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/3b6bdb38883c469d9c9e0bdd60eefbb4 : SUCCESS in 3m 51s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/64c9d44a0caa4957a9c26719fd1ba28e : SUCCESS in 3m 51s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/a41d8a1d37fd427ea47ac83657fbc721 : FAILURE in 4m 21s