# Drift Detection: Output Distribution Shift + Embedding-Cluster Anomaly

> Source: https://sukruyusufkaya.com/en/learn/fine-tuning-cookbook/ftc-drift-detection-output-shift
> Updated: 2026-05-14T14:43:02.018Z
> Category: Fine-Tuning Cookbook (Model-by-Model)
> Module: Part XVI — Production Operations
**TLDR:** Models 'drift' over time in production: input distribution shifts, output style changes. Detection: response length histogram shift, embedding distance baseline → mean cluster drift, thumbs-down rate trend. Cookbook's weekly drift report — alarm + auto-retrain trigger.