---
title: "Level 3 overview | Grafana Labs"
description: "Introduction to transaction insights"
---

> For a curated documentation index, see [llms.txt](/llms.txt). For the complete documentation index, see [llms-full.txt](/llms-full.txt).

## Level 3: Transaction insights

**What you learned in Module 3:**

- Shift from infrastructure view to service view.
- RED metrics show service health: Rate, Errors, Duration.
- Service Inventory and Service Graph reveal service relationships.
- Getting instrumented enables service-level visibility.

* * *

**What you’ll do in this module:**

Level 3 tools let you drill from service averages to individual transactions:

- **What problems Level 3 solves** — Moving from service averages to specific transactions
- **Distributed tracing** — Following a request across all services
- **Continuous profiling** — Code-level CPU/memory analysis
- **Frontend observability** — Real user session capture
- **AI observability** — Monitoring LLM performance
- **Operations at Level 3** — Request-level troubleshooting

**Estimated time:** 15-20 minutes