Loading increases every two hours (RRDCached tuning) since a check_mk crash

[Yggy]

Maybe changing max_concurrent_checks in ~/etc/nagios/nagios.d/timing.cfg helps.
See:

Checks running in bursts causing OOM

There is an option but only on the command line → ~/etc/nagios/nagios.d/timing.cfg Adjust the option “max_concurrent_checks” in maximum to the double number of your CPU cores or lower. Per default this value is set to 0 what means start all checks you want

In my situation it dropped the mem usage and cpu load a lot.