I am no expert on Nagios, but I think you would ride a lot smoother just setting up a clean Checkmk installation and add all the hosts from your old environment.
Possibly, I am not certain if there would be an upgrade path to get to a ‘supported’ setup.
But cleaning out from time to time can really valuable in my experience. I know it takes time, but you often find a lot of stuff that can be thrown out, which both eases administration and often improves performance of the monitoring itself.
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