[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/eae4800d49674f91bfbe0dec99973e... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/3dc3897ef0bf44c28fbe1e73b663d334 : SUCCESS in 3m 35s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/169ca937e3b84d2ab10e48c789b43d26 : FAILURE in 2m 57s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/831e9d667da64793988f6d83e54be6c8 : SUCCESS in 3m 40s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/c2183109c521451ba35d7c193e85684b : FAILURE in 3m 29s