[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/af30f5bfbd544b32b146f2fc8dc993... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/ff9e3a07d3714b9b9c4ecede9ce96500 : SUCCESS in 4m 44s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/71fa604a81b6402b9b62c274b6200b2b : SUCCESS in 4m 08s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/732f1de8c49e41d2b6194d7dae746096 : SUCCESS in 7m 06s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/0903fb952b26408cb0f47563915bcf90 : FAILURE in 5m 42s