[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/c823bf18930b4a9eb255c58b5538e4... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/84cda5976b5d41a29d49f1c2c08fdbe2 : SUCCESS in 3m 00s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/c6f303cda70348709e7dd009f2bc1dfe : FAILURE in 2m 32s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/05ac96d6fc904b1d8ddf9571877c1959 : SUCCESS in 2m 49s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/02366c3617d742b3b595e625e9bf5d69 : FAILURE in 2m 50s