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Hi,

>You can deploy several ceilometer and use several databases, or just one and use a different 'source' field for each of your region/cluster to differentiate where meters come from.

Thanks, Julien, I didn't know source it's meant to be presenting region/cluster info. I guess this wiki should be updated :)
http://wiki.openstack.org/EfficientMetering

In the field definition, source has two question marks there.  

Shengjie