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ProblemMap/GlobalFixMap/Eval_Observability/variance_and_drift.md
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# Eval Observability — Variance and Drift
<details>
<summary><strong>🧭 Quick Return to Map</strong></summary>
<br>
> You are in a sub-page of **Eval_Observability**.
> To reorient, go back here:
>
> - [**Eval_Observability** — evaluation metrics and system observability](./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>
Variance and drift checks detect when evaluation scores are **unstable across runs** or when **semantic meaning slowly shifts** without clear boundary failures.
These probes prevent "false confidence" in benchmarks by catching hidden instability.