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ProblemMap/GlobalFixMap/Cloud_Serverless/blue_green_switchovers.md
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# Blue-Green Switchovers for Serverless and Edge
<details>
<summary><strong>🧭 Quick Return to Map</strong></summary>
<br>
> You are in a sub-page of **Cloud_Serverless**.
> To reorient, go back here:
>
> - [**Cloud_Serverless** — scalable functions and event-driven pipelines](./README.md)
> - [**WFGY Global Fix Map** — main Emergency Room, 300+ structured fixes](../README.md)
> - [**WFGY Problem Map 1.0** — 16 reproducible failure modes](../../README.md)
>
> Think of this page as a desk within a ward.
> If you need the full triage and all prescriptions, return to the Emergency Room lobby.
</details>
A safe pattern to shift 100 percent of live traffic from **blue** to **green** without downtime, cache poison, or state skew. Works for API Gateway + Lambda, Cloudflare Workers, Vercel Edge, Fastly Compute, and similar stacks.
## Open these first