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Application level tracing for Rust.
| Date | Stars |
|---|---|
| 2026-07-24 | 6794 |
| 2026-07-25 | 6795 |
| 2026-07-28 | 6795 |
| 2026-07-30 | 6795 |
| 2026-08-06 | 6795 |
Today
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Momentum
0.0
growth rate 0.00%/day
![Tracing — Structured, application-level diagnostics][splash]
[splash]: https://raw.githubusercontent.com/tokio-rs/tracing/main/assets/splash.svg
[![Crates.io][crates-badge]][crates-url]
[![Documentation][docs-badge]][docs-url]
[![Documentation (v0.2.x)][docs-v0.2.x-badge]][docs-v0.2.x-url]
[![MIT licensed][mit-badge]][mit-url]
[![Build Status][actions-badge]][actions-url]
[![Discord chat][discord-badge]][discord-url]
[crates-badge]: https://img.shields.io/crates/v/tracing.svg
[crates-url]: https://crates.io/crates/tracing
[docs-badge]: https://docs.rs/tracing/badge.svg
[docs-url]: https://docs.rs/tracing
[docs-v0.2.x-badge]: https://img.shields.io/badge/docs-v0.2.x-blue
[docs-v0.2.x-url]: https://tracing.rs
[mit-badge]: https://img.shields.io/badge/license-MIT-blue.svg
[mit-url]: LICENSE
[actions-badge]: https://github.com/tokio-rs/tracing/workflows/CI/badge.svg
[actions-url]: https://github.com/tokio-rs/tracing/actions?query=workflow%3ACI
[discord-badge]: https://img.shields.io/discord/500028886025895936?logo=discord&label=discord&logoColor=white
[discord-url]: https://discord.gg/EeF3cQw
[Website](https://tokio.rs) |
[Chat](https://discord.gg/EeF3cQw)
## Overview
`tracing` is a framework for instrumenting Rust programs to collect
structured, event-based diagnostic information. `tracing` is maintained by the
Tokio project, but does _not_ require the `tokio` runtime to be used.
### Branch set-up
- [`main`](https://github.com/tokio-rs/tracing/tree/main) - Default branch, crates.io releases are done from this branch. This was previously the
`v0.1.x` branch.
- [`v0.2.x`](https://github.com/tokio-rs/tracing/tree/v0.2.x) - Branch containing the as-yet unreleased 0.2 version of `tracing-core`, `tracing`, and
all the other tracing crates that depend on these versions. This was previously the `master`
branch.
## Usage
### In Applications
In order to record trace events, executables have to use a `Subscriber`
implementation compatible with `tracing`. A `Subscriber` implements a way of
collecting trace data, such as by logging it to standard output.
[`tracing-subscriber`][tracing-subscriber-docs]'s [`fmt` module][fmt] provides
a subscriber for logging traces with reasonable defaults. Additionally,
`tracing-subscriber` is able to consume messages emitted by `log`-instrumented
libraries and modules.
To use `tracing-subscriber`, add the following to your `Cargo.toml`:
```toml
[dependencies]
tracing = "0.1"
tracing-subscriber = "0.3"
```
Then create and install a `Subscriber`, for example using [`init()`]:
```rust
use tracing::info;
use tracing_subscriber;
fn main() {
// install global subscriber configured based on RUST_LOG envvar.
tracing_subscriber::fmt::init();
let number_of_yaks = 3;
// this creates a new event, outside of any spans.
info!(number_of_yaks, "preparing to shave yaks");
let number_shaved = yak_shave::shave_all(number_of_yaks);
info!(
all_yaks_shaved = number_shaved == number_of_yaks,
"yak shaving completed."
);
}
```
Using `init()` calls [`set_global_default()`] so this subscriber will be used
as the default in all threads for the remainder of the duration of the
program, similar to how loggers work in the `log` crate.
[tracing-subscriber-docs]: https://docs.rs/tracing-subscriber/
[fmt]: https://docs.rs/tracing-subscriber/latest/tracing_subscriber/fmt/index.html
[`set_global_default`]: https://docs.rs/tracing/latest/tracing/subscriber/fn.set_global_default.html
For more control, a subscriber can be built in stages and not set globally,
but instead used to locally override the default subscriber. For example:
```rust
use tracing::{info, Level};
use tracing_subscriber;
fn main() {
let subscriber = tracing_subscriber::fmt()
// filter spans/events with level TRACE or higher.
.with_max_level(Level::TRACE)
// build but do not install the subscriber.
.finish();
tracing::subscriber::with_default(subscriber, || {
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Would you bet a product on this? Bounded 0–100 and slow moving.
matched fp:ee97f727bafa2512, topic:tracing