OpenTelemetry is a single instrumentation layer that produces traces, metrics, and logs in a vendor-neutral format. This guide explains what each signal is for, how the SDK and Collector relate, and where to go next.

Availability and latency are the obvious SLIs. But they don't fit every service type. This guide provides SLI selection frameworks for APIs, data pipelines, batch jobs, storage systems, event-driven services, and more.