[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/8cef5a5cd279484b98a1b6ad5d3f04... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/e4670b787e2d48a384d53a54b4f3a8d6 : SUCCESS in 3m 28s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/a706325a6e794bc9a08a7617f79b54bf : FAILURE in 2m 54s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/8f2198aeaed54603a28fbca74e72a4c6 : SUCCESS in 2m 47s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/0c22ea3d50c348d5b11813f5eb42f68b : FAILURE in 3m 41s