Detection Infrastructure The PMM system is configured to detect events that could constitute serious incidents. Automated alerts trigger when the safety monitoring layer flags outputs suggesting health or safety impact, when deployers report unexpected or harmful outcomes through established channels, when complaint volumes spike or patterns emerge suggesting systematic harm, and when monitoring metrics breach critical thresholds in ways suggesting real-world impact. Critical-severity alert thresholds corresponding to potential serious incidents should be more sensitive than standard PMM thresholds: a fairness metric breach exceeding a magnitude that could affect fundamental rights, a performance degradation in a safety-critical function that could affect health, a security breach that could compromise critical infrastructure. It is better to triage a false positive than to miss a genuine serious incident. Detection also depends on deployer feedback channels and complaint analysis. A pattern of similar complaints from affected persons may indicate a systematic problem that constitutes a serious incident even if no individual complaint describes severe harm. Key outputs

• PMM alert rules mapped to Article 3(49) criteria
• Critical thresholds more sensitive than standard PMM thresholds
• Deployer feedback and complaint pattern analysis as detection sources
• False positive tolerance preferred over missed detection