collectd
6.0#27 in metrics monitoring toolsFree planFree planLinuxSelf-hostedWindows
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collectd suits people who need a free, self-hosted way to gather system and application metrics. It may also fit those who want to use collected statistics to monitor performance or estimate future load.
Nagios XI suits teams that want to monitor infrastructure from a Linux server they manage. It is also relevant to organizations that need self-hosted deployment, node-based licenses, or offline installation.