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[Nicholas Leskiw <question162367@xxxxxxxxxxxxxxxxxxxxx>]

Question #162367 on Graphite changed:
https://answers.launchpad.net/graphite/+question/162367

    Status: Open => Answered

Nicholas Leskiw proposed the following answer:
By incremental counter, you mean the value only goes up?

E.g. The data looks like: 
2100,2130,2190,2210,2245,2275,2285....
If so, you can use the nonNegativeDerivative function to graph the hits per min:
37,60,20,35,30,10....

Then you can use the the divide function to draw the ratio per minute.

If you want a different time period, you can use the summarize()
function to then roll up the ratio into, for example, 15 minute time
periods:

&target=divide(summarize(nonNegativeDerivative(foo.bar.calls),15),summarize(nonNegativeDerivative(foo.bar.newSessions),15))

That may need adjustment; emailing from a mobile device, can't test the
URL.

-Nick

On Jun 22, 2011, at 1:05 PM, Ryan Butterfoss
<question162367@xxxxxxxxxxxxxxxxxxxxx> wrote:

> New question #162367 on Graphite:
> https://answers.launchpad.net/graphite/+question/162367
> 
> Hi all,
> 
> I'm new to graphite and looking to use it to do some metrics tracking for some web services.  We typically count the number of times a particular call is made, and also the number of unique sessions using the service.  Both are incremental counters.  One metric we'd like is the ratio of calls to new sessions.  This is simple enough to do with the divide series function, but doesn't help us if we want to track the ratio for a specific timespan, say time A to B.  If there were a bunch of calls prior to time A, then since the metric is a total over all time that will affect the ratio between time A and B.  Ideally what I'd like is a way to offset the number of calls by the value of calls at time A.  I see an offset that takes a single value, but what I really need is "offset by myvalue@timeA".
> 
> Is that possible?  Or is there another way to accomplish this?  
> 
> Thanks
> Ryan
> 
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