When graphing multiple metrics at once, and the metrics are counters
that require derivative(), always do derivative() before sumSeries(). If
you put sumSeries() before, and there are gaps in some metrics, the gaps
will show as huge spikes in the result. Placing derivative() as the
first function kills the spikes.
I had this issue today and it was quite puzzling, before I realized
what's going on. Would be nice if someone made an observation in the
docs, next to one of these functions. ;)
--
Florin Andrei
http://florin.myip.org/
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