[collectd] collectd calculations on multiple metrics?

[Matt Gravlin]

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. 

Thanks,Matt 		 	   		  
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