Comment 2 for bug 1922282

Looking at the ceilometer.conf in that job parameters under service_credentials section are set as expected.
 https://logserver.rdoproject.org/openstack-periodic-integration-main/opendev.org/openstack/tripleo-ci/master/periodic-tripleo-ci-centos-8-scenario001-standalone-master/9815483/logs/undercloud/var/lib/config-data/puppet-generated/ceilometer/etc/ceilometer/ceilometer.conf.txt.gz

So I don't think that the change in puppet-ceilometer[1] is the cause.

 [1] https://review.opendev.org/c/openstack/puppet-ceilometer/+/775730