|Component||Core & Setup|
|Title||Gracefully restart check_mk helpers in case of memory leak|
|Checkmk Edition||Checkmk Raw Edition (CRE)|
|Compatibility||Compatible - no manual interaction needed|
When using the Check_MK Micro Core in combination with inline SNMP then in certain rare situations the check_mk helper processes leak memory. We suspect the leak to be in the SNMP libs but this is just an assumption.
This fix now watches the size of each check_mk helper. If the memory usage (VM size) of the process grows by more then 50% compared to the size after the first 20 hosts being checked, then the helper silently restarts itself and leaves a message in var/log/check_mk/cmc-helper.log.