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Write symptom-based alerts with recording rules and error-budget burn rates, route them through Alertmanager, and learn where a single Prometheus server runs out of room. Part 3 of a series.

What observability is, how it differs from monitoring, what metrics, logs, and traces each answer, and the vocabulary (SLOs, RED, USE, golden signals) to learn before you pick a tool. Part 1 of a series.