[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/ab2429fb4d664e53afd6d8a694f553... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/1d2cd64bb03744adb26ce978585d9537 : SUCCESS in 4m 04s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/d482aad1c6644eaca1d1857a3593666b : SUCCESS in 3m 57s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/80c09a88becb4ad4b0822fe631ecdf54 : SUCCESS in 3m 59s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/8f9e2135ac294dd8bf2c91bf2d51acf6 : FAILURE in 2m 45s