# A/B + Shadow Traffic: Feature Flag + Canary 1%→5%→25% + Automated Rollback

> Source: https://sukruyusufkaya.com/learn/fine-tuning-cookbook/ftc-ab-shadow-canary-rollback
> Updated: 2026-08-11T09:28:34.553Z
> Category: Fine-Tuning Cookbook (Model-by-Model)
> Module: Part XVI — Production Operations
**TLDR:** Yeni FT model'i production'a koymanın güvenli yolu: shadow traffic (eski + yeni model paralel, response karşılaştır), canary deployment (kademeli rampuplama 1%→5%→25%→100%), feature flag (LaunchDarkly / GrowthBook / Unleash), automated rollback (P95 latency veya error rate threshold geçince).