The new ceilometer's Prometheus exporter, which exposes a Prometheus compatible scrape-endpoint directly on the ceilometer's compute and central agents will also need to be modified similarly to how sg-core was modified in: https://github.com/infrawatch/sg-core/pull/143/files#diff-f231edfeea51dd3684de75c2ecdbbfa31c9b2fae7006a86ec8eab5baa84f593eR281