# Deployment Rollback Manager with Automated Failure Recovery

## Module
ReleaseOrchestrator

## Status
VERIFIED

## Description
Automated deployment rollback system that plans rollback strategies for failed deployments, executes rollback to previous releases across multiple targets, tracks rollback progress, and generates rollback evidence. Supports RedeployPrevious, RestoreSnapshot, and Manual strategies.

## Implementation Details
- **Modules**: `src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Deployment/Rollback/`
- **Key Classes**:
  - `RollbackManager` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Deployment/Rollback/RollbackManager.cs`) - orchestrates rollback execution across targets
  - `RollbackPlanner` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Deployment/Rollback/RollbackPlanner.cs`) - plans rollback strategy (RedeployPrevious, RestoreSnapshot, Manual)
  - `PartialRollbackPlanner` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Deployment/Rollback/PartialRollbackPlanner.cs`) - plans partial rollbacks for subset of targets
  - `RollbackEvidenceGenerator` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Deployment/Rollback/RollbackEvidenceGenerator.cs`) - generates audit evidence for rollback actions
  - `HealthAnalyzer` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Deployment/Rollback/HealthAnalyzer.cs`) - analyzes deployment health to trigger rollback
  - `ImpactAnalyzer` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Deployment/Rollback/ImpactAnalyzer.cs`) - analyzes rollback impact before execution
- **Interfaces**: `IRollbackManager`, `IPartialRollbackPlanner`, `IHealthAnalyzer`, `IImpactAnalyzer`
- **Source**: SPRINT_20260110_107_004_DEPLOY_rollback_manager.md

## E2E Test Plan
- [ ] Trigger a rollback via `RollbackManager` and verify the previous release is restored
- [ ] Verify `RollbackPlanner` selects RedeployPrevious strategy when previous release is available
- [ ] Verify partial rollback: roll back only a subset of targets using `PartialRollbackPlanner`
- [ ] Verify `HealthAnalyzer` detects unhealthy deployment and triggers automatic rollback
- [ ] Verify `ImpactAnalyzer` estimates rollback impact before execution
- [ ] Verify `RollbackEvidenceGenerator` produces audit evidence for the rollback action


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