[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/024badb4c9214357a7c1157e871bc2... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/ab116276f50942bf81e09579ca64b888 : SUCCESS in 3m 12s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/b6a0f9d91457454fa829b2012e588954 : FAILURE in 2m 34s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/e3e57e3d2af04ed695ef92e66414897c : SUCCESS in 3m 12s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/97945669594a44c5ba2495e4d66e89cb : FAILURE in 2m 42s