diff --git a/PRODUCTION_READINESS.md b/PRODUCTION_READINESS.md
index 4a3915b6..e76dcde4 100644
--- a/PRODUCTION_READINESS.md
+++ b/PRODUCTION_READINESS.md
@@ -2,7 +2,14 @@
 
 **K-ArtSell Aegis v16.0** — Shadow Run Validation System
 
-**Status:** `IMPLEMENTATION_COMPLETE / READY_FOR_252DAY_REHEARSAL`
+**Status:** `VALIDATION_GATES_4_OF_5_COMPLETE / READY_FOR_252DAY_REHEARSAL`
+
+**Progress Summary:**
+- ✅ Gate 1: DbUp migrations (14 test scenarios)
+- ✅ Gate 2: Crash-recovery (6 test scenarios)  
+- ✅ Gate 4: Activation workflow (6 test scenarios)
+- ✅ Gate 5: Observability metrics (6 test scenarios)
+- ⏳ Gate 3: 252-day shadow run (pending live execution)
 
 ---
 
@@ -90,12 +97,12 @@
 - [x] **Implementation:** 3 endpoints (GetApprovalQueue, ApproveModel, RejectModel) + 6 integration tests
 
 #### 5. **Observability & Alerting** (REQUIRED)
-- [ ] Batch SLA dashboard: Job completion times, queue depths
-- [ ] Data quality quarantine: Monitor jobs marked `dq` (data quality issue)
-- [ ] Duplicate detection: Alert if outbox dedup constraint violated
-- [ ] Reconciliation breaks: Evidence vs current state mismatch
-- [ ] Model drift: OOS performance tracking vs baseline
-- **Action:** Wire Serilog → observability backend (Seq, Grafana, etc.)
+- [x] Batch SLA dashboard: Job completion times, queue depths (IObservabilityService.GetBatchSlaMetricsAsync)
+- [x] Data quality quarantine: Monitor jobs marked `dq` (GetDataQualityMetricsAsync)
+- [x] Duplicate detection: Alert if outbox dedup constraint violated (GetDuplicateDetectionMetricsAsync)
+- [x] Reconciliation breaks: Evidence vs current state mismatch (GetReconciliationMetricsAsync)
+- [x] Model drift: OOS performance tracking vs baseline (GetModelDriftMetricsAsync)
+- [x] **Implementation:** ObservabilityService + GetObservabilityMetrics endpoint + 6 integration tests
 
 ---