Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

OpenTelemetry

A standard for collecting traces, metrics, and logs across services.

OpenTelemetry defines APIs, SDKs and a wire protocol (OTLP) so spans from many services join into one distributed trace, viewed in tools like Jaeger or Grafana Tempo.