# Cost Observability: Token-Level Cost + FinOps Tagging + Idle GPU Detector

> Source: https://sukruyusufkaya.com/en/learn/fine-tuning-cookbook/ftc-cost-observability-finops
> Updated: 2026-05-14T14:43:02.282Z
> Category: Fine-Tuning Cookbook (Model-by-Model)
> Module: Part XVI — Production Operations
**TLDR:** Bring production LLM TCO under control: per-request token cost tracking, customer-level FinOps tagging, idle GPU detector (alarm if vLLM utilization < 50%), cost-per-query trend, alarm thresholds.