[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/998652c871e8407482f7f94bd56b09... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/309da29ef3a14e55a94af26af1c378a6 : SUCCESS in 3m 07s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/c593ba4ca22448f48792cb10901d9791 : FAILURE in 2m 37s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/c08b8b1c6637412d9ab1579f398320e2 : SUCCESS in 4m 02s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/77e5648568364341aa3c4b5874693679 : FAILURE in 3m 34s