On 05/29/2012 07:58 PM, Doug Hellmann wrote: > > > On Tue, May 29, 2012 at 12:30 PM, Loic Dachary <l...@enovance.com > <mailto:l...@enovance.com>> wrote: > > On 05/29/2012 05:42 PM, Doug Hellmann wrote: > > IIRC, the meters discussed in the wiki [1] are supposed to show "delta" > values (usage since the last time an event was generated), although the > "Alternate Gauge Design" section discusses cumulative meters instead. The > libvirt pollsters we have now produce cumulative data, and it might be > complicated and error-prone to change them to compute the deltas internally > before generating events. On the other hand, some of the other counters may > be more complicated to generate as cumulative values. > > > > Rather than taking an either/or approach, I propose we document for > each counter whether it uses the delta or cumulative approach. The API server > can ask the meter plugin for that piece of information when calculating the > aggregate value so that the caller does not have to keep track of the rules > for each meter. > > > I tend to prefer using a gauge and I agree that documenting what was > preferred (gauge or delta) for a given meter / counter is enough. > > > Just to be clear, by "gauge" do you mean the cumulative form of the counter? > Yes, I do ;-)
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