I just installed Munin for monitoring my web and database server. I lot of plugins were included out-of-the box, but I could use some advice on which one is actually good key indicators to monitor.
Disk IOs per device Disk latency per device Disk usage in percent Inode usage in percent Throughput per device Utilization per device Fork rate Number of threads Processes Processes priority VMstat CPU usage File table usage Inode table usage Load average Memory usage Swap in/out
So my question is; which of these parameters are key indicators and has any value to monitor?
Note: I also use the plugins for Apache and MySQL, but here I am interested in the disk/system/process plugins. I have asked advice for what to monitor on the database on Database Administrators: http://dba.stackexchange.com/questions/77162/what-to-monitor-key-indicators-for-mysql-server
Collect it all. You’ll find a use for it later, or wish you had been collecting it from the beginning.
Of course, the things you aren’t collecting here are the most important things. Is the database working? How well? Is the web server serving? Is the web site functioning? Can people still place orders?
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