Munin is my favorite monitoring tool. One reason (among many mentioned here already) is that its information density is higher than anything else. When your sit

Munin is my favorite monitoring tool. One reason (among many mentioned here already) is that its information density is higher than anything else. When your site goes down and you need to know why, the page full of tight graphs is incredibly helpful. You can scan everything without any clicks at all and see if the problem is disk, RAM, database locks, etc. This compactness is the main criterion Tufte uses throughout Visual Display of Quantitative Information. I don't think Munin is doing anything clever or original (nothing like the map of Napolean's march), but it is far more useful than most of the custom d3 "dataviz" stuff you see. And it's way faster to navigate than something like datadog. And since it's just serving static HTML, the page loads instantly. I think the homepage was overdue for a redesign, but I hope they don't redesign the tool itself! :-) If they are trying to improve their communication, one thing I would have appreciated when I got started years ago is a clearer tutorial-like explanation about where the client & server live, how both execute (daemon vs cron), and who opens a connection to whom. Just the basic big picture architecture. It seemed difficult to find that information. EDIT: This right here: "Munin has a master/node architecture in which the master connects to all the nodes at regular intervals and asks them for data." Great! ANOTHER EDIT: I see they are emphasizing how easy it is to write plugins. I can attest to that. I've written plugins for Postgres and Phusion Passenger, and both were really simple. Also there are tons of "contrib" plugins that probably already have most of what you want (even beyond the extensive default system-level metrics). AND ANOTHER: The graphs at http://demo.munin-monitoring.org/munin-monitoring.org/www.munin-monitoring.org/ http://demo.munin-monitoring.org/munin-monitoring.org/www.mu... are more painful to read than my existing deployments. They are 497x261, and my own graphs are 499x277. That doesn't seem like enough difference to matter. The font is smaller though. Having to squint to read the graphs makes the display a lot more effort to read. It's a small thing, but I could feel the difference immediately.