Hello Lars,
QRadar is not officially supported for sending snmp traps from OS to outside of box.
This below link is official support for sending SNMP Trap by QRadar Rule response.
https://www.ibm.com/support/knowledgecenter/SS42VS_7.4/com.ibm.qradar.doc/c_qradar_adm_snmp_config.html
You may config in RHEL OS Side but which is tune of the QRadar Box.
<How to send snmp traps for monitoring CPU, disk and Memory?>
https://access.redhat.com/solutions/3808261
Regards, Brian
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