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# 0.1.42 (November 26, 2025) ### Important The [`Span::record_all`] method has been removed from the documented API. It was always unsuable via the documented API as it requried a `ValueSet` which has no publically documented constructors. The method remains, but should not be used outside of `tracing` macros. ### Added - **attributes**: Support constant expressions as instrument field names ([#3158]) - Add `record_all!` macro for recording multiple values in one call ([#3227]) - **core**: Improve code generation at trace points significantly ([#3398]) ### Changed - `tracing-core`: updated to 0.1.35 ([#3414]) - `tracing-attributes`: updated to 0.1.31 ([#3417]) ### Fixed - Fix "name / parent" variant of `event!` ([#2983]) - Remove 'r#' prefix from raw identifiers in field names ([#3130]) - Fix perf regression when `release_max_level_*` not set ([#3373]) - Use imported instead of fully qualified path ([#3374]) - Make `valueset` macro sanitary ([#3382]) ### Documented - **core**: Add missing `dyn` keyword in `Visit` documentation code sample ([#3387]) [#2983]: https://github.com/tokio-rs/tracing/pull/#2983 [#3130]: https://github.com/tokio-rs/tracing/pull/#3130 [#3158]: https://github.com/tokio-rs/tracing/pull/#3158 [#3227]: https://github.com/tokio-rs/tracing/pull/#3227 [#3373]: https://github.com/tokio-rs/tracing/pull/#3373 [#3374]: https://github.com/tokio-rs/tracing/pull/#3374 [#3382]: https://github.com/tokio-rs/tracing/pull/#3382 [#3387]: https://github.com/tokio-rs/tracing/pull/#3387 [#3398]: https://github.com/tokio-rs/tracing/pull/#3398 [#3414]: https://github.com/tokio-rs/tracing/pull/#3414 [#3417]: https://github.com/tokio-rs/tracing/pull/#3417 [`Span::record_all`]: https://docs.rs/tracing/0.1.41/tracing/struct.Span.html#method.record_all
tracing-attributes
Macro attributes for application-level tracing.
Overview
tracing is a framework for instrumenting Rust programs to collect
structured, event-based diagnostic information. This crate provides the
#[instrument] attribute for automatically instrumenting functions using
tracing.
Note that this macro is also re-exported by the main tracing crate.
Compiler support: requires rustc 1.65+
Usage
First, add this to your Cargo.toml:
[dependencies]
tracing-attributes = "0.1.31"
This crate provides the #[instrument] attribute for instrumenting a function
with a tracing span. For example:
use tracing_attributes::instrument;
#[instrument]
pub fn my_function(my_arg: usize) {
// ...
}
Supported Rust Versions
Tracing is built against the latest stable release. The minimum supported version is 1.65. The current Tracing version is not guaranteed to build on Rust versions earlier than the minimum supported version.
Tracing follows the same compiler support policies as the rest of the Tokio project. The current stable Rust compiler and the three most recent minor versions before it will always be supported. For example, if the current stable compiler version is 1.69, the minimum supported version will not be increased past 1.66, three minor versions prior. Increasing the minimum supported compiler version is not considered a semver breaking change as long as doing so complies with this policy.
License
This project is licensed under the MIT license.
Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Tokio by you, shall be licensed as MIT, without any additional terms or conditions.