[collectd] collectd calculations on multiple metrics?

Matt Gravlin mediastream at hotmail.com
Tue Aug 4 01:20:37 CEST 2015

Is there a way to pre-calculate metrics using basic math before sending them to an output plugin such as Graphite? For example, I would like to calculate memory as a percent when the metrics gathered only provide free and used. I can do this using Graphite functions, but I would prefer to just send a calculated metric from collectd rather than using Graphite formulas. 

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