OpenTelemetry

OpenTelemetry is a CNCF project that provides a single set of specifications, APIs, SDKs, and the OTLP wire protocol for generating and exporting traces, metrics, and logs. Formed from the merger of OpenTracing and OpenCensus, it gives applications one vendor-neutral way to instrument code and ship telemetry to any compatible backend. That decoupling of instrumentation from vendor is what makes it the de-facto standard for observability.

• Three signals - Traces, metrics, and logs are covered by one coherent data model rather than three disconnected tools.
• OTLP protocol - The OpenTelemetry Protocol defines how telemetry moves from applications to collectors and backends over gRPC or HTTP.
• Collector - A standalone agent receives, processes, and routes telemetry, so pipelines can be reshaped without touching application code.
• Vendor-neutral instrumentation - Instrument once against the OTel API, then point the data at any observability vendor without re-instrumenting.

In real API operations, OpenTelemetry is how a request is followed across service boundaries — each API call carries trace context so latency, errors, and dependencies are visible end to end. Standardizing on OTel means an organization can switch or combine observability vendors without rewriting instrumentation, and governance teams can insist on one telemetry contract across every service. Paired with OpenMetrics for the metrics format, it anchors a portable observability stack that also gives agents a consistent, machine-readable view of how APIs actually behave in production.