Munin is a networked resource monitoring tool that can help analyze resource trends and “what just happened to kill our performance?” problems.
It is designed to be very plug and play. A default installation provides a lot of graphs with almost no work.
This is free and open source software.
Key Features
- Easy to install.
- Scalable – monitor all-scales installations, from your home Raspberry Pi up to a 100+ nodes cluster.
- Real-time alerts – polls your servers once every 5 minutes. Don’t wait any longer to be notified when something goes wrong.
- Flexible – choose from 500+ available plugins to monitor every service running on your server.
- Extensible – write your own plugins in the language of your choice to supervise whatever you want.
Website: munin-monitoring.org
Support: GitHub Code Repository
Developer: Munin developers
License: GNU General Public License v2.0

Munin is written in Perl. Learn Perl with our recommended free books and free tutorials.
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Read our verdict in the software roundup.
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