New question #211821 on Graphite:
https://answers.launchpad.net/graphite/+question/211821

My problem is that i have a counter which increment over the life over the app. 
I would like to graph the rate of change in the incremented value. So ideally I 
need to chart the delta of this value over time. Also i need to do a little 
arithmetic over a couple of delta'ed counters. To be more specific i have an 
incrementing counter of ' time spent querying' and one for 'number of queries' 
i would like to chart a time per query. Which would be something like:

  delta (number of queries, over time t)  /delta(time spent querying, over time 
t) 
 
How could this be achieved? 

I have considered patching carbon to add a new aggregation function of delta 
but that would still leave the division bit.

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