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

Build failed. https://zuul.opendev.org/t/openstack/buildset/54e0ca68433f4ac690c8eea268dad9... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/f27f5e50b06d41e58a4124216ad433a7 : TIMED_OUT in 30m 55s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/841dd481683e48bc9af2e3c0653b531e : SUCCESS in 2m 33s - openstack-tox-py38 https://zuul.opendev.org/t/openstack/build/13ebe60a213c4c279832c7dfc7414401 : TIMED_OUT in 40m 47s