# A/B Testing Experiment Engine

## Module
ReleaseOrchestrator

## Status
VERIFIED

## Description
A/B testing experiment engine with deterministic variant assignment, p-value statistical analysis, and experiment lifecycle management for controlled rollouts.

## Implementation Details
- **Modules**: `src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Progressive/`, `src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.ProgressiveDelivery/`
- **Key Classes**:
  - `AbReleaseManager` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Progressive/AbRelease/AbReleaseManager.cs`) - experiment lifecycle management with variant assignment
  - `CanaryController` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.ProgressiveDelivery/CanaryController.cs`) - statistical analysis and auto-advance logic for experiments
  - `TrafficManager` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.ProgressiveDelivery/TrafficManager.cs`) - manages traffic distribution between experiment variants
  - `FeatureFlagBridge` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Progressive/FeatureFlags/FeatureFlagBridge.cs`) - bridges feature flags with experiment variants
- **Source**: SPRINT_20260117_035

## E2E Test Plan
- [ ] Create an experiment with control and treatment variants and verify deterministic variant assignment
- [ ] Verify statistical analysis: collect metrics during experiment and verify p-value calculation
- [ ] Verify experiment lifecycle: create, start, observe, conclude experiment through full lifecycle
- [ ] Verify early stopping: trigger statistical significance threshold and verify auto-conclusion
- [ ] Verify `FeatureFlagBridge` maps experiment variants to feature flag states


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