[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/e5c6cb6c679c4fbd9a12bddbd4d1c2... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/960b08ea803a43d7877a96bf74eb9fe1 : SUCCESS in 2m 47s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/74af127bfcf74a6185e9b7a082a24ed6 : FAILURE in 3m 08s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/e82c247bba914be3b344109960a33f88 : SUCCESS in 3m 50s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/362f45e64b99473396174c0f595fc69d : FAILURE in 4m 43s