# 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)