monitoring-observability
Monitoring and Observability
Concepts, tooling, and operational practices for monitoring production systems and responding to incidents effectively.
1. The Three Pillars of Observability
Logs
- Discrete events emitted by applications (errors, state changes, audit trails).
- High cardinality: every event can carry unique context.
- Best for debugging specific incidents after the fact.
Metrics
- Numeric measurements aggregated over time (counters, gauges, histograms).
- Low cardinality by design: labels should have bounded value sets.
- Best for detecting trends, setting thresholds, and alerting.
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