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

Build failed. https://zuul.opendev.org/t/openstack/buildset/55b8a3c87a0b49c4b49f62e4e7e3da... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/ab4ac043647340779be5a5b102c737a0 : SUCCESS in 4m 27s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/7298616ef311478980aa60bbfe510a7a : SUCCESS in 4m 00s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/1402be6aa7474e05bb278af09aeded6e : SUCCESS in 4m 22s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/786eda03235f4ceb8c869f37a9eaeb8b : FAILURE in 5m 02s