OpenTelemetry (OTel)

An open, vendor-neutral standard and set of SDKs for producing and sending traces, metrics and logs.

OpenTelemetry is a Cloud Native Computing Foundation project formed by merging OpenTracing and OpenCensus. It defines the APIs, SDKs and the OTLP protocol, but it is not a backend: the data goes to a tool you choose, open source or commercial. Many platforms and libraries emit it out of the box.

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Related terms

Observability (o11y): Being able to tell what a running system is doing, and why, from the data it emits: logs, metrics and traces.
LLM observability: Tracing every model call with inputs, outputs, latency, tokens, cost and the user outcome.
SLO and SLI: An SLI is a measured indicator of service quality; an SLO is the internal target for it, stricter than any SLA you sign.

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