[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/c39ed935235840e0b26f59606aa385... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/aab4be9143ed4755827f2e19ef98df8e : SUCCESS in 3m 32s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/f0b14b8944cb4cb9a0060e9814bc1455 : FAILURE in 2m 46s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/3f886be58e954ab2a1329ca68ffc0048 : SUCCESS in 2m 32s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/bfc10836fcc84644bf0eafac5e11ea84 : FAILURE in 3m 18s