Add network in/out byte rate meters, and API meters.
Openstack reports in/out byte rates for each vm and for each device on those VMs, but I aggregate the per-device stats into per-VM in/out totals. Currently, I'm reporting these API calls: * (network,subnet,port,router).(create,update,delete) * (image).(upload,update) API calls are reported from which "host" they were issued (I think); if there is no host info logged (like for images), the hostname is "null".
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