[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/f08adcd940964af5ae81976e08c236... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/a9eb0d84be014625b42fe1c39663b3d2 : SUCCESS in 2m 46s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/68758db0869c4c3a89a8d0486f94eee2 : FAILURE in 2m 40s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/390fdd037f6d449ca926f3e673849d58 : SUCCESS in 3m 01s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/1eda8ec076784f46861a17e3d1e3c132 : FAILURE in 3m 19s