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I would argue that its not and that it's a mess, starting with that URL. This is yet another fork of an outdated monitoring system(how many Nagios forks are there?) The architecture diagram made my head hurt, how many moving parts is that? I counted 8 separate components. There are much more modern monitoring systems these days such as Prometheus, Bosun and Riemann.

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Check_mk is not a nagios/icinga fork, it's an addon that works with them. It's a host agent (like NRPE) that bundles all the local checks in a single run and submits them on Nagios as a passive check.

There is also icinga2. So how does one decide which one to use? For a mixed environment (windows, linux, etc) which monitoring tool is better when both server and client is considered?

IMHO Icinga 2 is also way too many moving parts. For mixed environments, you should be able to run both Prometheus and Bosun:

https://prometheus.io/download/ https://bosun.org/downloads

Thanks for the information. Currently, we are using icinga + check_mk combination and mostly happy with that. However since both icinga and check_mk are going their ways, it is no longer possible to use them together. Also I want to check out some modern alternatives like the ones you suggested.

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