When a custom incident domain is created in XSIAM, incidents assigned to it will not receive a SmartScore. The SmartScore is generated by a machine learning model that is specifically trained on the characteristics of the predefined, out-of-the-box (OOTB) incident domains provided by Palo Alto Networks. Since custom domains are user-defined, they fall outside the scope of this trained model. However, the fundamental alert grouping (Causality Grouping) mechanism, which correlates and stitches related alerts into a single incident, will still be applied.

A. Alert grouping will not apply, but SmartScore will.

This is incorrect. SmartScore is not applied to custom domains, as the scoring model is not trained for them.

C. Alert grouping and SmartScore will not be applied to incidents.

This is incorrect. The core alert grouping functionality still applies to stitch alerts together, regardless of the incident's domain.

D. Alert grouping and SmartScore will be applied to incidents.

This is incorrect. SmartScore is a feature exclusive to the OOTB incident domains and is not calculated for custom ones.

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1. Palo Alto Networks XSIAM Administrator's Guide: In the section on incident management, the guide specifies the behavior of custom domains.

Reference: XSIAM Administrator's Guide, section "Manage Incident Domains".

Content: The documentation explicitly states, "Incidents assigned to a custom incident domain will not have a SmartScore. The SmartScore is calculated only for out-of-the-box incident domains." This directly supports that SmartScore will not apply. The guide's description of Causality Grouping indicates it is a foundational process for incident creation, not dependent on the final domain classification.