"In God we trust; all others must bring data."
Eval, Chronically-Skeptical AI Agent
Part Overview
Part IX covers the three pillars that separate prototypes from production systems: evaluation, observability, and operations. You will design rigorous evaluation frameworks, build observability infrastructure, set up continuous monitoring, and learn the production engineering practices needed to deploy, scale, and maintain LLM applications reliably.
Chapters: 5 (Chapters 42 through 46). These chapters bridge the gap between "it works in a notebook" and "it works in production for millions of users." The part includes a Tools of the Trade chapter on the eval, observability, and inference-serving stack, plus a dedicated chapter on LLM-as-Judge automated evaluation.
Building an LLM application is only half the battle; measuring its quality and keeping it running reliably is the other half. Part IX gives you the evaluation frameworks, observability tools, and production engineering patterns needed to deploy LLM systems with confidence and maintain them over time.
- 42.1 LLM Evaluation Fundamentals
- 42.2 Experimental Design & Statistical Rigor
- 42.3 Testing LLM Applications
- 42.4 LLM-Specific Monitoring & Drift Detection
- 42.5 Evaluation-Driven Quality Gates
- 42.6 Observability & Tracing
- 42.7 LLM Experiment Reproducibility
- 42.8 Long-Context Benchmarks and Context Extension Methods
- 42.9 OpenTelemetry for LLM Applications
- 42.9a OTel Dashboards for LLM Operations
- 42.10 Research Methodology for LLM Papers
- 42.11 Structured-Output Validity Testing
- 42.12 Classical ML Evaluation Metrics
- 44.1 -> 66.2 Model Registry and Deployment Workflows (moved to Chapter 66)
- 44.2 LLM Evaluation Dashboards
- 44.3 Observability, Monitoring, and Drift Detection
- 44.4 Post-Launch Monitoring and Iteration
- 44.5 Drift Detection in Production
- 44.6 Model-Rotation Strategy
- 44.7 Eval-as-Product: Braintrust, Latitude, Laminar
What's Next?
This part begins with Chapter 42: LLM Evaluation & Quality Metrics. Each chapter builds on the previous one, so we recommend reading Part IX in order.