[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/fb02054a4a924d86a6509e3bcca087... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/75030dbae7374c6f8ee897539dbb4bff : SUCCESS in 2m 33s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/ae17e55c59004f7c86b4e86d71aa8652 : FAILURE in 3m 10s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/9bd82125d2bd4ae5b5e286c629602306 : SUCCESS in 3m 13s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/ac04b7a53f3744e681d7c0f3c33c9b41 : FAILURE in 2m 39s