Crate

tracing

Structured, contextual, async-aware logging and diagnostics.

What it is

tracing provides a framework for instrumenting Rust programs with structured events and spans. Unlike the log crate, tracing events carry typed key-value fields and can be grouped into spans representing units of work, enabling log correlation, distributed tracing, and context propagation across async tasks.

Why it is commonly used

The modern standard for observability in Rust services. Subscribers forward events to stdout, structured JSON logs, OpenTelemetry, Jaeger, and other backends. Used in web servers, gRPC services, and any production code that needs structured logging or tracing.

731
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1.1k
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