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deploy/telemetry/alerts/scanner-fn-drift-alerts.yaml

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+# Scanner FN-Drift Alert Rules
+# SLO alerts for false-negative drift thresholds (30-day rolling window)
+
+groups:
+  - name: scanner-fn-drift
+    interval: 30s
+    rules:
+      - alert: ScannerFnDriftWarning
+        expr: scanner_fn_drift_percent > 1.0
+        for: 5m
+        labels:
+          severity: warning
+          service: scanner
+          slo: fn-drift
+        annotations:
+          summary: "Scanner FN-Drift rate above warning threshold"
+          description: "FN-Drift is {{ $value | humanizePercentage }} (> 1.0%) over the 30-day rolling window."
+          runbook_url: "https://docs.stellaops.io/runbooks/scanner/fn-drift-warning"
+
+      - alert: ScannerFnDriftCritical
+        expr: scanner_fn_drift_percent > 2.5
+        for: 5m
+        labels:
+          severity: critical
+          service: scanner
+          slo: fn-drift
+        annotations:
+          summary: "Scanner FN-Drift rate above critical threshold"
+          description: "FN-Drift is {{ $value | humanizePercentage }} (> 2.5%) over the 30-day rolling window."
+          runbook_url: "https://docs.stellaops.io/runbooks/scanner/fn-drift-critical"
+
+      - alert: ScannerFnDriftEngineViolation
+        expr: scanner_fn_drift_cause_engine > 0
+        for: 1m
+        labels:
+          severity: page
+          service: scanner
+          slo: determinism
+        annotations:
+          summary: "Engine-caused FN drift detected (determinism violation)"
+          description: "Engine-caused FN drift count is {{ $value }} (> 0). This indicates non-feed, non-policy changes affecting outcomes."
+          runbook_url: "https://docs.stellaops.io/runbooks/scanner/fn-drift-engine-violation"