What are the three pillars of observability?

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The three pillars of observability are:

Metrics: Numerical measurements over time
- Examples: Response time, error rate, throughput
- Tools: Prometheus, CloudWatch, DataDog
Logs: Discrete events with timestamps
- Examples: Error messages, audit trails, debug info
- Tools: ELK Stack, Splunk, Fluentd
Traces: Request flow through distributed system
- Examples: End-to-end request journey
- Tools: Jaeger, Zipkin, AWS X-Ray

Why all three needed:

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