[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/60473d80f2c04d93b9559cd46aba53... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/be41c319d64143da817b41dda08d4cd9 : SUCCESS in 2m 39s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/25c27d793e4d4e0383ac851f929fd183 : FAILURE in 3m 14s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/ac36a7bfdfed40bdaef6ecb608878135 : SUCCESS in 3m 18s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/18638198cfa747e59ca5ee69d05346f9 : FAILURE in 2m 59s