1![Tracing — Structured, application-level diagnostics][splash] 2 3[splash]: https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/splash.svg 4 5# tracing-subscriber 6 7Utilities for implementing and composing [`tracing`][tracing] subscribers. 8 9[`tracing`] is a framework for instrumenting Rust programs to collect 10scoped, structured, and async-aware diagnostics. The `Subscriber` trait 11represents the functionality necessary to collect this trace data. This 12crate contains tools for composing subscribers out of smaller units of 13behaviour, and batteries-included implementations of common subscriber 14functionality. 15 16`tracing-subscriber` is intended for use by both `Subscriber` authors and 17application authors using `tracing` to instrument their applications. 18 19[![Crates.io][crates-badge]][crates-url] 20[![Documentation][docs-badge]][docs-url] 21[![Documentation (master)][docs-master-badge]][docs-master-url] 22[![MIT licensed][mit-badge]][mit-url] 23[![Build Status][actions-badge]][actions-url] 24[![Discord chat][discord-badge]][discord-url] 25![maintenance status][maint-badge] 26 27[Documentation][docs-url] | [Chat][discord-url] 28 29[tracing]: https://github.com/tokio-rs/tracing/tree/master/tracing 30[tracing-fmt]: https://github.com/tokio-rs/tracing/tree/master/tracing-subscriber 31[crates-badge]: https://img.shields.io/crates/v/tracing-subscriber.svg 32[crates-url]: https://crates.io/crates/tracing-subscriber 33[docs-badge]: https://docs.rs/tracing-subscriber/badge.svg 34[docs-url]: https://docs.rs/tracing-subscriber/latest 35[docs-master-badge]: https://img.shields.io/badge/docs-master-blue 36[docs-master-url]: https://tracing-rs.netlify.com/tracing_subscriber 37[mit-badge]: https://img.shields.io/badge/license-MIT-blue.svg 38[mit-url]: LICENSE 39[actions-badge]: https://github.com/tokio-rs/tracing/workflows/CI/badge.svg 40[actions-url]:https://github.com/tokio-rs/tracing/actions?query=workflow%3ACI 41[discord-badge]: https://img.shields.io/discord/500028886025895936?logo=discord&label=discord&logoColor=white 42[discord-url]: https://discord.gg/EeF3cQw 43[maint-badge]: https://img.shields.io/badge/maintenance-experimental-blue.svg 44 45*Compiler support: [requires `rustc` 1.63+][msrv]* 46 47[msrv]: #supported-rust-versions 48 49## Supported Rust Versions 50 51Tracing is built against the latest stable release. The minimum supported 52version is 1.63. The current Tracing version is not guaranteed to build on Rust 53versions earlier than the minimum supported version. 54 55Tracing follows the same compiler support policies as the rest of the Tokio 56project. The current stable Rust compiler and the three most recent minor 57versions before it will always be supported. For example, if the current stable 58compiler version is 1.69, the minimum supported version will not be increased 59past 1.66, three minor versions prior. Increasing the minimum supported compiler 60version is not considered a semver breaking change as long as doing so complies 61with this policy. 62 63## License 64 65This project is licensed under the [MIT license](LICENSE). 66 67### Contribution 68 69Unless you explicitly state otherwise, any contribution intentionally submitted 70for inclusion in Tracing by you, shall be licensed as MIT, without any additional 71terms or conditions. 72
