 Rule Evaluation in FortiSIEM: Rules in FortiSIEM are evaluated periodically to check if the defined conditions or subpatterns are met.

 Frequency Field: The Frequency field in a rule determines the interval at which the rule's subpattern will be evaluated.

Evaluation Interval: This defines how often the system will check the incoming events against the rule's subpattern to determine if an incident should be triggered.

Impact on Performance: Setting an appropriate frequency is crucial to balance between timely detection of incidents and system performance.

 Examples:

If the Frequency is set to 5 minutes, the rule will evaluate the subpattern every 5 minutes.

This means that every 5 minutes, the system will check if the conditions defined in the subpattern are met by the incoming events.

 References: FortiSIEM 6.3 User Guide, Rules and Incidents section, which explains the Frequency field and how it impacts the evaluation of subpatterns in rules.