DashBoard/openspec/specs/migration-gates-and-rollout/spec.md

Purpose

Define stable requirements for migration-gates-and-rollout.

Requirements

Requirement: Migration Gates SHALL Define Cutover Readiness

The system SHALL define explicit migration gates for functional parity, build integrity, drawer visibility parity, and operational health before final cutover.

Scenario: Gate evaluation before cutover

• WHEN release is prepared for final cutover
• THEN all required migration gates MUST pass or cutover SHALL be blocked

Scenario: Functional parity gate fails

• WHEN any critical route or core workflow parity check fails during gate execution
• THEN release governance MUST treat the cutover as failed and prevent promotion

Requirement: Rollout and Rollback Procedures MUST be Actionable

The system SHALL document actionable rollout and rollback procedures for SPA-shell migration and iframe decommission.

Scenario: Rollback execution

• WHEN post-cutover validation fails critical checks
• THEN operators MUST be able to execute documented rollback steps to restore previous stable behavior

Scenario: Kill-switch rollback

• WHEN severe production regression is detected after cutover
• THEN operators MUST be able to disable the new navigation path through a documented kill-switch mechanism and recover service usability within the defined rollback target time

Requirement: Migration Gates SHALL Include Runtime Resilience Validation

Cutover readiness gates MUST include resilience checks for pool exhaustion handling, circuit-breaker fail-fast behavior, and recovery flow.

Scenario: Resilience gate evaluation

• WHEN migration gates are executed before release
• THEN resilience tests MUST pass for degraded-response semantics and recovery path validation

Requirement: Migration Gates SHALL Include Frontend Compute Parity Validation

Cutover readiness MUST include parity validation for metrics shifted from backend to frontend computation.

Scenario: Compute parity gate

• WHEN a release includes additional frontend-computed metrics
• THEN gate execution MUST verify parity fixtures and fail if tolerance contracts are violated

Requirement: Rollout Procedure MUST Include Conda-Systemd-Watchdog Rehearsal

Rollout and rollback runbooks SHALL include an operational rehearsal for service start, watchdog-triggered reload, and post-restart health checks under the conda/systemd runtime contract.

Scenario: Pre-cutover rehearsal

• WHEN operators execute pre-cutover rehearsal
• THEN they MUST successfully complete conda-based start, worker reload, and health verification steps documented in the runbook

Requirement: Migration Gates SHALL Enforce Architecture Documentation Consistency

Cutover governance MUST include verification that runtime architecture contracts documented for operators match implemented deployment and resilience behavior.

Scenario: Documentation gate before release

• WHEN release gates are executed for a migration or hardening change
• THEN project README artifacts MUST be updated to reflect current single-port runtime contract, resilience diagnostics, and frontend modularization strategy

Scenario: Gate fails on stale architecture contract

• WHEN implementation introduces resilience or module-governance changes but README architecture section remains outdated
• THEN release governance MUST treat the gate as failed until documentation is aligned