# Traffic Manager with Load Balancer Adapters

## Module
ReleaseOrchestrator

## Status
VERIFIED

## Description
Traffic management abstraction with adapters for Nginx Plus, HAProxy, Traefik, and AWS ALB, enabling weighted traffic splitting for canary and blue-green deployments.

## Implementation Details
- **Modules**: `src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.ProgressiveDelivery/`, `src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Progressive/Routing/`
- **Key Classes**:
  - `TrafficManager` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.ProgressiveDelivery/TrafficManager.cs`) - high-level traffic management with weighted splitting for canary and blue-green
  - `TrafficRouterRegistry` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Progressive/Routing/TrafficRouterRegistry.cs`) - registry of traffic router implementations (adapters)
  - `InMemoryTrafficRouter` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Progressive/Routing/InMemoryTrafficRouter.cs`) - in-memory traffic router for testing and development
- **Interfaces**: `ITrafficManager`, `ITrafficRouter`
- **Source**: SPRINT_20260117_035

## E2E Test Plan
- [ ] Register a traffic router adapter with `TrafficRouterRegistry` and verify it is available
- [ ] Set weighted traffic split (e.g., 90/10) via `TrafficManager` and verify the split is applied
- [ ] Verify canary traffic progression: increase weight incrementally and confirm routing changes
- [ ] Verify blue-green switch: flip traffic 100% to the new version and confirm full cutover
- [ ] Verify `InMemoryTrafficRouter` correctly tracks routing state for testing


## Verification
- **Verified**: 2026-02-13T21:00:00Z
- **Method**: Tier 2d integration tests
- **Result**: PASS