[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/6c4b816322674238a752d5f8ad0da2... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/e457bad311e64d0894717445fcfe9703 : SUCCESS in 3m 03s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/44bd04f7592d4518b115280c1be81584 : FAILURE in 4m 41s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/c154f6559e39404b99f01a8c8709fee0 : SUCCESS in 3m 10s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/ecefa8d78ba54373922923d77573913a : FAILURE in 3m 14s