This is the blog of Ronald Bartels that wanders on and off the subject of problem management (that is how it started), but it is best described by Ray who says this is Daddy's thoughts! Like the best music is from the Eighties and a wee dram helps in solving most inconveniences.
Nagios Core monitoring software: lots of plugins, steep learning curve
The free and open-source network monitoring software Nagios Core has a
long and strong reputation, providing the base for other monitoring
suites - Icinga, Naemon and OP5 among them – and a history dating back
to 2002 when it launched under the name NetSaint.