[Openstack-stable-maint] Stable check of openstack/oslo.cache for ref refs/heads/stable/train failed

Build failed. https://zuul.opendev.org/t/openstack/buildset/490a8799c43e4e6ea5548759f42ed2... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/55f9d657eb9c43108fd908fa45c434af : SUCCESS in 7m 34s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/9e431e7bcbef4075a53bf358f0978800 : SUCCESS in 4m 44s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/42b31f2496ba488ea003a63461b27325 : SUCCESS in 4m 15s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/76d79101654f490fa5e6fb80aa4290cd : FAILURE in 4m 26s