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Ceilometer API

Hi guys, I'm new to Openstack and Ceilometer. Even if I've read the Ceilometer documentation, I haven't understood how the Ceilometer API work, so I don't have a clue.. These are my questions:

  • How can I choose which metrics to meter on each node? (for example, for a compute node I need the CPU metric but not the RAM metric: can I meter the first one and not the second one?)

  • Can I add/modify new nodes or metrics to meter by API?

  • Is there a graphing system tied to the data store?

Thank you in advance!