[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/9b660faefe10421796c1afbfed2b5b... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/999cbf9e93ac46c4b7ac2fa700b7fe9a : SUCCESS in 4m 33s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/103b0f4e3e314b16a0bf890bd71faf2b : SUCCESS in 4m 07s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/c56e08fcf4fa4c18be1ea099b776781b : SUCCESS in 3m 07s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/a125cdd3fae74a8092b9005261481417 : FAILURE in 3m 59s