[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/e4193cadcba949f29ec50da0b0f698... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/0c1d4202d5b648c5b3b833817cc8bfdc : SUCCESS in 2m 55s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/09c6ac16f2aa45e8a7092747b70ad278 : FAILURE in 2m 52s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/95229babb2c641278b21e3a86a7f4b4e : SUCCESS in 3m 01s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/d31f2f11b83b4c66a1f867a38c18d0aa : FAILURE in 3m 01s