Comment 27 for bug 1539253

Steps to reproduce:
1. Deploy environment with 3 controllers/mongo and 3 compute/ceph nodes. Ceph should be used as a backend for all cloud storages.
2. Create VM with volume from image. Wait for 10 minutes to get usage metrics collected.
3. Search compute logs for errors:
# grep -r 'internal error: missing storage backend for network files using rbd protocol' /var/log/ceilometer-all.log | wc -l