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

Build failed. https://zuul.opendev.org/t/openstack/buildset/4276f8147a9a47f0902f3750961c26... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/2047da24654b4f75908ec3b09099e8c6 : POST_FAILURE in 7m 39s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/64a1eff39a7349ec8af3d2300bd25f28 : SUCCESS in 4m 38s - openstack-tox-py38 https://zuul.opendev.org/t/openstack/build/b429c9b345ac4479b56f83b4c513f1ad : SUCCESS in 4m 25s