tokio-rs/tracing

Health v2 · maintenance only

Adoption not part of the score

6856 stars · 925 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

tracing is a Rust framework for instrumenting applications to emit structured, event-based diagnostic data, built around spans with duration and causality rather than single log lines. It is maintained by the Tokio project but works without the Tokio runtime, and integrates with the log ecosystem via tracing-subscriber.

Use cases

• add structured logging to a Rust application
• trace async task execution across interleaved futures
• instrument library code with spans and events
• collect distributed tracing data from Rust services
• replace println debugging with proper diagnostics
• bridge log-crate output into a structured tracing subscriber

When to choose

• you need structured, contextual diagnostics in Rust, especially for async/concurrent code
• you want spans with timing and causality rather than flat log lines
• you need a widely adopted, production-proven logging facade with subscriber ecosystem

When to avoid

• you only need simple println-style logging in a small script
• your project is not written in Rust
• you need a full metrics or APM solution rather than trace instrumentation

Facets

library · maturity stable

logging tracing monitoring developer-tools backend performance rust cross-platform structured-logging diagnostics async spans observability tokio

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