[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/237b169184b54c1a88f95aa1460c40... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/a2eea817b1644c8f89c80b23dce6eefb : SUCCESS in 3m 13s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/623b0f16cb2447ea9e155f96cfa9d43b : FAILURE in 2m 35s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/2f0a5655d41f4462aef95cd46d5000ff : SUCCESS in 3m 23s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/79e0a0e9f150462bb020a6267c761601 : FAILURE in 2m 48s