linuxnewbieguide.org
80 Linux Monitoring Tools for SysAdmins — The Ultimate Linux Newbie Guide
Have a look at this excellent list of tools for monitoring your Linux servers! We could add the same list, but it would just be downright thievery, it’s the most comprehensive list of its kind we’ve seen before: https://blog.serverdensity.com/80-linux-monitoring-tools-know/