[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/eb48e35b1bac4c8da97d675c792d9e... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/b7fa14d12c854187bcd3d352acd337a6 : SUCCESS in 4m 45s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/315341fbb67642dc8f245d6fb4c8125a : FAILURE in 2m 33s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/a3b8a6b42e0e4eed971ec9b1c2bd6e0e : SUCCESS in 4m 17s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/b7d14580e8c545249e54957b5501351b : FAILURE in 2m 52s