Monitoring CPU and memory usage from Postgres
Let's say you have a cluster of Postgres database servers and you want a way to easily monitor their CPU and memory usage. You could install any of the system monitoring daemons like Nagios, Collectd, Munin, etc, but that means opening up another port in your firewall, and maintaning another running process. If all you're after is basic info like CPU and memory usage, there's an easier way!
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