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When executing: './check_ncpa.py -H 192.168.2.11 -t 'MyToken' -M 'plugins/check_procs' -a "-w 3 -c 5 -s Z"' I always see 1 or 2 zombieprocesses, even though there are none.
If the same plugin is used via NRPE it shows the correct number of zombie processes, and that'll be 0
Further investigations, shows me that the zombies is in fact a result of the check running - by monitoring the server with top, I do see 1 or 2 zombieprocesses popping up during the check and the disappearing at once.