Check manual page of cpu_threads

Total Number of Current Processes and Threads
Distribution	official part of Check_MK
License	GPL
Supported Agents	Linux AIX Freebsd Macosx Netbsd Openbsd Solaris

Monitor the number of processes and threads. If too many processes and threads are found then the check results in a warning or critical state. The default levels are set to 2000 and 4000.

Discovery

One service is created for each Linux host. The check parameter is set to {threads_default_levels}. If you need individual levels for your hosts, please define this explicitely in {checks}.