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How can I set up Ganglia so that I get an email if a machine in the cluster is using, for example, greater than 95% of physical RAM?

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Ganglia is not meant to to do alerting. It is designed to provide performance metrics for capacity planning. For alerting I would advice something like Nagios. There is however a addon for ganglia that does alerting: ganglia-alert. Did not use it but it looks promising.

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    ganglia-alert works fine. it's a daemon that monitors ganglia's output and can trigger emails based on thresholds or ratios going out of bounds, etc. – Erik Aronesty Oct 11 '16 at 20:32

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