A/B Release Manager (Traffic Splitting Between Versions)

Module

ReleaseOrchestrator

Status

VERIFIED

Description

A/B release management for running parallel control/treatment versions with configurable traffic weight distribution, experiment metrics tracking, and promote/rollback based on results.

Implementation Details

Modules: src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Progressive/AbRelease/
Key Classes:
- AbReleaseManager (src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Progressive/AbRelease/AbReleaseManager.cs) - manages A/B release lifecycle with traffic weight distribution
- InMemoryAbReleaseStore (src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Progressive/AbRelease/InMemoryAbReleaseStore.cs) - in-memory store for A/B release state
- TrafficRouterRegistry (src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Progressive/Routing/TrafficRouterRegistry.cs) - registry of traffic routers for A/B splits
- InMemoryTrafficRouter (src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Progressive/Routing/InMemoryTrafficRouter.cs) - in-memory traffic routing implementation
Interfaces: IAbReleaseManager, IAbReleaseStore, ITrafficRouter
Source: SPRINT_20260110_110_001_PROGDL_ab_release_manager.md

E2E Test Plan

Create an A/B release with 80/20 traffic split and verify both versions receive traffic at configured weights
Verify promote: promote the treatment version and confirm all traffic shifts to it
Verify rollback: rollback the A/B release and confirm all traffic returns to control version
Verify AbReleaseManager tracks experiment metrics during the A/B test period
Verify invalid state transitions are rejected (e.g., promoting an already-concluded experiment)

Verification

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

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