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
<[email protected]> 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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