[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/60641852d1174696b3572f614b162f... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/0f60317164cf4d3e87ecb5904186edb9 : SUCCESS in 4m 21s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/9dbfe23c20c74f6997c756def7fee6d9 : FAILURE in 3m 04s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/e6cc546d621e41faa33184bcc06d83a4 : SUCCESS in 3m 49s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/62b560c260b84c22bf45f574d39ed887 : FAILURE in 2m 52s