[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/2cf3319afb394593b01bb2b63004d6... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/b38abddd873643e2b6f4577fa689dff5 : SUCCESS in 3m 52s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/854d2cecf5144cb2ae006c5b1cfefcd1 : SUCCESS in 4m 17s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/12321eb52fa146c3b86aa8f31c960093 : SUCCESS in 4m 00s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/7c348e77a15c480a9b4d32805f829f1e : FAILURE in 6m 08s