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

> Source: https://sukruyusufkaya.com/learn/fine-tuning-cookbook/ftc-cost-observability-finops
> Updated: 2026-08-13T17:46:45.723Z
> Category: Fine-Tuning Cookbook (Model-by-Model)
> Module: Part XVI — Production Operations
**TLDR:** Production LLM TCO'sunu kontrol altına almak: per-request token cost tracking, customer-level FinOps tagging (kimin user'ı kaç token), idle GPU detector (vLLM serving'de utilization %50'nin altına düşerse alarm), cost-per-query trend, alarm thresholds.