save checkpoint. addition features and their state. check some ofthem

docs/features/checked/gateway/stellarouter-performance-testing-pipeline.md

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+# StellaRouter Performance Testing Pipeline (k6 + Prometheus + Correlation IDs)
+
+## Module
+Gateway
+
+## Status
+VERIFIED
+
+## Description
+Performance testing pipeline with k6 load test scenarios (A-G), correlation ID instrumentation, Prometheus-compatible metrics, and Grafana dashboards for performance curve modeling.
+
+## Implementation Details
+- **k6 load tests**: `src/Gateway/__Tests/load/gateway_performance.k6.js` -- 7 scenarios A-G (511 lines)
+- **Performance metrics**: `src/Gateway/StellaOps.Gateway.WebService/Services/GatewayPerformanceMetrics.cs` -- Prometheus counters/histograms + scenario config models (318 lines)
+- **Correlation ID middleware**: `src/Gateway/StellaOps.Gateway.WebService/Middleware/CorrelationIdMiddleware.cs` -- correlation ID propagation with validation (64 lines)
+- **Gateway metrics**: `src/Gateway/StellaOps.Gateway.WebService/Services/GatewayMetrics.cs` -- base Prometheus metrics
+- **Health monitoring**: `src/Gateway/StellaOps.Gateway.WebService/Services/GatewayHealthMonitorService.cs`
+- **Grafana dashboard**: `devops/telemetry/dashboards/stella-ops-gateway-performance.json`
+- Source: Feature matrix scan
+
+## E2E Test Plan
+- [x] Verify k6 scenarios A-G exist and cover the required traffic patterns
+- [x] Test correlation ID propagation overhead measurement
+- [x] Verify Prometheus metrics are exposed correctly
+- [x] Verify Grafana dashboard exists
+
+## Verification
+- **Run ID**: run-002
+- **Date**: 2026-02-09
+- **Method**: Tier 1 code review + Tier 2d integration tests
+- **Build**: PASS (0 errors, 0 warnings)
+- **Tests**: PASS (202/202 gateway tests pass)
+- **Code Review**:
+  - k6 script (511 lines): All 7 scenarios verified: A (health baseline), B (OpenAPI under load), C (routing throughput), D (correlation ID overhead), E (rate limit boundary), F (connection ramp/saturation), G (sustained soak).
+  - GatewayPerformanceMetrics (318 lines): Prometheus counters (requests, errors, rate-limits), histograms (request/auth/transport/routing durations), scenario config models with PerformanceCurvePoint.
+  - GatewayPerformanceMetricsTests (418 lines, 20+ tests): Verify scenario configs, curve point computed properties, threshold violations, observation recording.
+  - CorrelationIdMiddlewareTests (71 lines, 4 tests): ID generation, echo, TraceIdentifier sync.
+  - Note: Feature file's "What's Missing" section is STALE -- k6 scripts and Grafana dashboard DO exist.
+- **Verdict**: PASS