Observability 101: Metrics, Logs, and Traces

Why Observability

Software is a team sport. The bigger the team (and the more services), the more “wait, what just happened?” moments you get in production. Observability is how you answer those questions fast, without guesswork.

Short version: observability helps you see what your system is doing right now so you can ship faster, sleep better, and fix things before customers start tweeting.

Mental model: turn your system from a black box into a glass box. You’ll use three complementary lenses: metrics, logs, and traces.