# Phase 9 - Rollout, Migration, and Hypercare

Reference artifacts:
- docs/adr/0010-release-strategy-and-migration-rollback.md
- docs/release-readiness-checklist.md
- docs/go-live-evidence-package.md
- docs/multi-wallet/multi-wallet-phase-tracker.md

## 1. Phase Objective
Execute controlled production rollout, monitor system health, and close post-release issues with formal hypercare completion.

Phase status target:
- Start: not-started
- End: done when rollout stabilizes and hypercare closure criteria are met.

## 2. Scope
In scope:
- Production deployment sequencing.
- Runtime migration and backfill execution.
- Controlled feature rollout and monitoring.
- Incident handling and rollback if required.
- Hypercare metrics and closure report.

Out of scope:
- Net-new feature development.

## 3. Work Breakdown
## Track A: Deployment and Migration
1. Execute rollout plan by environment.
- Owner: Operations + Platform
- Output: staged deployment logs.

2. Run production migration/backfill with safeguards.
- Owner: DBA + Platform
- Output: migration and verification report.

## Track B: Runtime Monitoring
1. Monitor key SLOs and domain health indicators.
- Owner: SRE + Observability
- Output: health dashboard tracking.

2. Monitor business KPIs for transaction correctness.
- Owner: Product + Finance Ops
- Output: KPI validation report.

## Track C: Hypercare and Closure
1. Triage and resolve post-release defects.
- Owner: Domain Teams
- Output: defect resolution log.

2. Produce hypercare closure package.
- Owner: Program Lead
- Output: closure decision and remaining backlog.

## 4. Execution Checklist
- [ ] Production rollout completed by approved sequence.
- [ ] Migration/backfill completed with verification.
- [ ] Monitoring and alerting active for multi-wallet metrics.
- [ ] Incident response paths validated.
- [ ] Any critical issues resolved or mitigated.
- [ ] Hypercare review meetings completed.
- [ ] Closure report published.
- [ ] Tracker updated with Phase 9 progress.

## 5. Verification Checklist
- [ ] No unresolved P0 incident after stabilization window.
- [ ] Ledger, transfer, and FX metrics match expected baselines.
- [ ] Audit and compliance logging continuity is intact.
- [ ] Rollback path remained available throughout rollout window.

## 6. Exit Criteria
Phase completes only when:
- Stabilization period ends without critical unresolved issues.
- Cross-functional closure approval is recorded.
- Remaining work is moved to normal backlog.

## 7. Deliverables
- Rollout and migration execution logs
- Hypercare metrics report
- Incident and mitigation summary
- Program closure note
- Updated tracker entry