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<a href="https://nixstats.com/" target="_blank"><strong>Nixstats</strong></a> is an easy to use server and monitoring <a href="https://hackernoon.com/tagged/tool" target="_blank">tool</a>. You can monitor your servers <a href="https://hackernoon.com/tagged/cpu" target="_blank">CPU</a>, Memory, Disk I/O and many more metrics. The monitoring agent is open source and easy to extend with your own plugins, so you can basically monitor any metric and create charts and alerts.