LESSON 4.1
Observability: logs, metrics, traces
Learn key techniques and workflows in System Design Foundations.
8m
intermediate
7,897 students
Overview
Metrics tell you something is wrong, traces tell you where, logs tell you why. You need all three, and they need to share request ids.
In this lesson you will:
- Instrument the three signals and correlate them
- Alert on symptoms users feel, not on causes
- Trace a request across service boundaries
Pro Tip
Use caching and revalidation wisely to ensure your app stays fast and data remains fresh without unnecessary requests.