Observability, Drawn

How telemetry actually flows from your code to a dashboard and an alert: OpenTelemetry, the Collector, Prometheus, traces and sampling, logs, and the alerting that wakes the right person. Step through each diagram with the buttons or your arrow keys, then use the 30-second answer, the gotchas and the quiz to make it stick.

Based on the OpenTelemetry, Prometheus and Grafana documentation; each chapter links to its sources. For the cost side, see Taming Cardinality.