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I've got three metrics "memoryFree", "memoryBuffered", "memoryCached". These metrics appear under each of the ec2 hosts in the following metric tree: system.radar123.collectd.ec2*_com.memory. For each ec2 host I would like to sum the three metrics and display the sum. How to do this? Is there a graphite web function that will iterate over the wildcard and treat each one separately?

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This can be done by groupByNode:

groupByNode(system.radar123.collectd.ec2*_com.memory-{buffered,cached,free},3,\"sumSeries\")

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