[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/a5c28e1eba1c4951831878bc8282b2... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/5d89216663b44c52a2ee559e3ee9a2d0 : SUCCESS in 4m 43s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/2c435f6db7be4f29b621781acc3bc521 : FAILURE in 3m 24s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/4c11003f23f04b6599e920979f4d2c69 : SUCCESS in 3m 13s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/15b634c3c63c4d879743611ad50df203 : FAILURE in 4m 09s