101 — Introduction to Observability

Beginner

Understand the three pillars of observability (metrics, logs, traces), learn the Four Golden Signals, RED and USE methods, and see why observability matters for modern systems. Starting state: nothing required. After this lesson: conceptual foundation for the course, plus a quick taste of real Prometheus metrics.

Learning Objectives

Define observability and how it differs from monitoring

Explain the three pillars: metrics, logs, and traces

Apply the Four Golden Signals to any service

Use the RED and USE methods to choose what to measure

Understand how OpenTelemetry unifies instrumentation

Step 1

What is observability?

Understand the difference between monitoring and observability. Monitoring tells you when something is wrong; observability helps you understand why.

Commands to Run

cat <<'EOF'
Observability = Metrics + Logs + Traces
Monitoring asks: Is it working?
Observability asks: Why is it broken?
EOF

What This Does

Monitoring relies on predefined checks — you decide in advance what to watch. Observability lets you ask arbitrary questions about your system after the fact, using the telemetry data it produces. A truly observable system lets you debug novel problems you didn't anticipate.

Expected Outcome

You see the three lines printed, summarizing the core distinction.

Pro Tips

1
Think of monitoring as a dashboard of known metrics, and observability as a detective toolkit for unknown problems

Was this step helpful?