[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/04d2d3cbdd27449ba8866da1914113... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/6fa87651f70440dc9a0f7c15833808e7 : SUCCESS in 3m 49s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/961ce3c0e75848c582ae0363ab7f1e64 : FAILURE in 4m 59s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/d7c5bfb27eaa465095715b552aa8546d : SUCCESS in 4m 44s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/3edd0f575cfa4c34b442aad59a1d1c2e : FAILURE in 5m 19s