title: "Addendum 12 — Sandbox Blue-Green · Feature Flags — August 2026" date: "2026-08-31" author: "ATLAS Engine"
Addendum 12 — Sandbox Blue-Green · Feature Flags
WS9 — Zero-downtime secure deployments | August 2026
Overview
WS9 introduces a complete Blue-Green deployment infrastructure for both Azure Container Apps (API + Frontend), along with an integrated Feature Flags system for dark-launches.
Blue-Green Deployment
- New revisions deploy with 0% traffic (sandbox)
- Automated health checks (5 retries, 10s interval)
- Auto-promote on success / auto-rollback on failure
- 7 admin API endpoints for revision management
Feature Flags
- Global on/off flags with percentage rollout
- Per-organization overrides
- Auto-expiry support
- Public check endpoint for frontend integration
Build: #494 | Commit: 0f11d61