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docs/features/checked/web/web-gateway-observability-surfaces.md

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+# Web Gateway Observability Surfaces (Health, SLO, Traces, Logs, Incident Mode)
+
+## Module
+Web
+
+## Status
+IMPLEMENTED
+
+## Description
+Web gateway observability client providing health aggregation, SLO burn-rate metrics with exemplar links, distributed trace inspection, structured log queries, evidence/attestation pass-through, incident mode toggle, and sealed-mode status APIs.
+
+## Implementation Details
+- **Feature directory**: `src/Web/StellaOps.Web/src/app/core/telemetry/`
+- **Services**:
+  - `telemetry-sampler` (`src/Web/StellaOps.Web/src/app/core/telemetry/telemetry-sampler.service.ts`)
+  - `ttfs-telemetry` (`src/Web/StellaOps.Web/src/app/core/telemetry/ttfs-telemetry.service.ts`)
+- **Source**: SPRINT_0214_0001_0001_web_iii.md
+
+## E2E Test Plan
+- **Setup**:
+  - [ ] Log in with a user that has appropriate permissions
+  - [ ] Navigate to the relevant page/section where this feature appears
+  - [ ] Ensure test data exists (scanned artifacts, SBOM data, or seed data as needed)
+- **Core verification**:
+  - [ ] Verify the component renders correctly with sample data
+  - [ ] Verify interactive elements respond to user input
+  - [ ] Verify data is fetched and displayed from the correct API endpoints
+- **Edge cases**:
+  - [ ] Verify graceful handling when backend API is unavailable (error state)
+  - [ ] Verify responsive layout at different viewport sizes
+  - [ ] Verify accessibility (keyboard navigation, screen reader labels, ARIA attributes)