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.

2.2k
Repositories
92%
Actively maintained
2.0k
Updated ≤ 30 days
5.5M
Total stars
1.8k
Owners

Counted from the Cargo.toml manifests of the 2.2k indexed repositories that declare tracing as a dependency — not download counts. Dependency data last verified 2026-08-13.

Browse 2200 repositories using tracing in Repos →
Often used with

Crates that show up unusually often in tracing projects. The most distinctive pairings rank first — crates these projects use far more than the average indexed Rust project does, not just crates that are popular everywhere. Each percentage is the share of tracing projects that also use it.

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