Determine the final P1..P4 priority from severity, service tier, and AI suggestion. FIRST matching rule wins. severity service_tier ai_suggested_priority classification "disaster" - - - "P1" "Disaster severity always overrides" "critical" - - - "P1" "Critical severity always overrides" - - - "security.incident" "P1" "Security incidents are always P1" "high" "tier_1" - - "P1" "High on tier_1 service" "high" "tier_2" - - "P2" "High on tier_2 service" "high" - - - "P2" "High severity, lower tier" "average" "tier_1" - - "P2" "Average on tier_1 service" "average" "tier_2" - - "P3" "Average on tier_2 service" "warning" - - - "P3" "Warning severity" "information" - - - "P4" "Informational" - - "P1" - "P1" "Fallback: trust AI suggestion P1" - - "P2" - "P2" "Fallback: trust AI suggestion P2" - - "P3" - "P3" "Fallback: trust AI suggestion P3" - - - - "P4" "Default when nothing else matches"