[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/4d98a129d5054bac9dd28a9e36f186... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/cd80133a7bb24d7d970bc48b85c7931b : SUCCESS in 3m 32s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/bc981c6d5a8f4c92887a9a139ebbe2ee : FAILURE in 3m 50s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/256e22ae2bba45a6b3f5b025e547bb33 : SUCCESS in 3m 03s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/eb8995b6501a4b03be56ba0ac90cc088 : FAILURE in 3m 10s