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Questions about diagnostics command and nova-compute events



I'm trying to understand the output from the diagnostics command, since i'm
unable to test it myself since it does not work with KVM.
Are all the fields based on information gathered at the time of request or
are there some who are cumulative? I suspect the network might represent
the total amount instead of the current network data transfer at the time.

Secondly, is there any way i can insert some callback into nova-compute to
know when an instance is launched/terminated in order to start the
monitoring with other tools?