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.
Instrument one small app with a counter and a histogram, run Prometheus 3.x in Docker Compose, and answer how much, how broken, and how slow with three PromQL queries. Part 2 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.