collectd is great because takes very few resources (cpu/memory) to collect statistics very rapidly and you can log your results however you wish (back to graph

collectd is great because takes very few resources (cpu/memory) to collect statistics very rapidly and you can log your results however you wish (back to graph collectors, straight to CSV for later processing, out to custom processes or network protocols for other services to consume). If you want to be lazy and not set up a complete graphing infrastructure, just run collectd, have it automatically log all your statistics, and use it with the bundled https://collectd.org/wiki/index.php/Collectd-web https://collectd.org/wiki/index.php/Collectd-web package to view your history when needed.