What are the three pillars of observability?

What are the three pillars of observability?

• A. Logs, metrics, traces
• B. Events, dashboards, alerts
• C. Users, sessions, revenue
• D. Networks, storage, compute

Answer: (A)

Observability is about understanding how a system behaves by collecting and analyzing data from multiple viewpoints. The three pillars are logs, metrics, and traces. Logs are collections of discrete events with timestamps and context that tell you exactly what happened, which is invaluable for diagnosing issues and understanding failures. Metrics are numerical measurements over time, such as latency, error rate, or throughput, that let you monitor health, detect trends, and set alerts. Traces capture the path of a single request as it moves through a distributed system, showing how long each hop takes and where bottlenecks occur, which helps isolate performance problems across services. These three together give a complete picture: logs provide detailed events, metrics give quantitative trends, and traces reveal end-to-end call flow. The other options describe elements used in monitoring or performance data, but they don’t comprise the core set that defines observability.

Observability is about understanding how a system behaves by collecting and analyzing data from multiple viewpoints. The three pillars are logs, metrics, and traces. Logs are collections of discrete events with timestamps and context that tell you exactly what happened, which is invaluable for diagnosing issues and understanding failures. Metrics are numerical measurements over time, such as latency, error rate, or throughput, that let you monitor health, detect trends, and set alerts. Traces capture the path of a single request as it moves through a distributed system, showing how long each hop takes and where bottlenecks occur, which helps isolate performance problems across services.

These three together give a complete picture: logs provide detailed events, metrics give quantitative trends, and traces reveal end-to-end call flow. The other options describe elements used in monitoring or performance data, but they don’t comprise the core set that defines observability.