# 0.3.18 (November 13, 2023)

This release of `tracing-subscriber` adds support for the [`NO_COLOR`] environment
variable (an informal standard to disable emitting ANSI color escape codes) in
`fmt::Layer`, reintroduces support for the [`chrono`] crate, and increases the
minimum supported Rust version (MSRV) to Rust 1.63.0.

It also introduces several minor API improvements.

### Added

- **chrono**: Add [`chrono`] implementations of `FormatTime` ([tokio-rs#2690])
- **subscriber**: Add support for the [`NO_COLOR`] environment variable in
`fmt::Layer` ([tokio-rs#2647])
- **fmt**: make `format::Writer::new()` public ([tokio-rs#2680])
- **filter**: Implement `layer::Filter` for `Option<Filter>` ([tokio-rs#2407])

### Changed

- **log**: bump version of `tracing-log` to 0.2 ([tokio-rs#2772])
- Increased minimum supported Rust version (MSRV) to 1.63.0+.

[`chrono`]: https://github.com/chronotope/chrono
[`NO_COLOR`]: https://no-color.org/
[tokio-rs#2690]: tokio-rs#2690
[tokio-rs#2647]: tokio-rs#2647
[tokio-rs#2680]: tokio-rs#2680
[tokio-rs#2407]: tokio-rs#2407
[tokio-rs#2772]: tokio-rs#2772

Thanks to @shayne-fletcher, @dmlary, @kaifastromai, and @jsgf for contributing!

# 0.2.3 (November 13, 2023)

This release contains several new features. It also increases the
minimum supported Rust version (MSRV) to Rust 1.63.0.

### Added

- **rolling**: add option to automatically delete old log files (tokio-rs#2323)
- **non_blocking**: allow worker thread name to be configured (tokio-rs#2365)
- **rolling**: add a builder for constructing `RollingFileAppender`s
  (tokio-rs#2227)
- **rolling**: add `Builder::filename_suffix` parameter (tokio-rs#2225)
- **non_blocking**: remove `Sync` bound from writer for `NonBlocking`
  (tokio-rs#2607)
- **non_blocking**: name spawned threads (tokio-rs#2219)

### Fixed

- Fixed several documentation typos and issues (tokio-rs#2689, tokio-rs#2375)

### Changed

- Increased minimum supported Rust version (MSRV) to 1.63.0+ (tokio-rs#2793)
- Updated minimum `tracing-subscriber` version to
  [0.3.18][subscriber-v0.3.18] (tokio-rs#2790)

[subscriber-v0.3.18]:
    https://github.com/tokio-rs/tracing/releases/tag/tracing-subscriber-0.3.18

# 0.2.0 (October 24th, 2023)

This release contains two breaking changes: the removal of the `env_logger`
and `trace_logger` features. Below are the suggested migration paths:

- `env_logger`: users should use [`tracing_subscriber::fmt::Subscriber`]
  or [`tracing_subscriber::fmt::Layer`] with the [`Targets`] or
  [`EnvFilter`] filters instead.
- `trace_logger`: users should use the `tracing` crate's
  ["log" feature flag][log-feature] instead.

### Breaking Changes

- Remove deprecated `env_logger` feature. This removes the dependency
  on the unmaintained `atty` crate, resolving the security advisory
  [GHSA-g98v-hv3f-hcfr]/[RUSTSEC-2021-0145]. ([tokio-rs#2771])
- Remove deprecated `trace_logger` feature. ([tokio-rs#2771])

[tokio-rs#2771]: tokio-rs#2771
[`tracing_subscriber::fmt::Subscriber`]: https://docs.rs/tracing-subscriber/0.3.17/tracing_subscriber/fmt/struct.Subscriber.html
[`tracing_subscriber::fmt::Layer`]: https://docs.rs/tracing-subscriber/0.3.17/tracing_subscriber/fmt/struct.Layer.html
[`Targets`]: https://docs.rs/tracing-subscriber/0.3.17/tracing_subscriber/filter/targets/struct.Targets.html
[`EnvFilter`]: https://docs.rs/tracing-subscriber/0.3.17/tracing_subscriber/filter/struct.EnvFilter.html
[log-feature]: https://docs.rs/tracing/latest/tracing/#emitting-log-records
[GHSA-g98v-hv3f-hcfr]: GHSA-g98v-hv3f-hcfr
[RUSTSEC-2021-0145]: https://rustsec.org/advisories/RUSTSEC-2021-0145.html

# 0.1.4 (October 23rd, 2023)

### Changes

- Deprecated `env_logger` feature in favor of
  `tracing_subscriber::fmt::Subscriber` [tokio-rs#2752]

# 0.1.40

This release fixes a potential stack use-after-free in the
`Instrument::into_inner` method. Only uses of this method are affected by this
bug.

### Fixed

- Use `mem::ManuallyDrop` instead of `mem::forget` in `Instrument::into_inner`
  ([tokio-rs#2765])

[tokio-rs#2765]: tokio-rs#2765

Thanks to @cramertj and @Manishearth for finding and fixing this issue!

# 0.1.32 (October 13, 2023)

### Documented

- Fix typo in `field` docs (tokio-rs#2611)
- Remove duplicate wording (tokio-rs#2674)

### Changed

- Allow `ValueSet`s of any length (tokio-rs#2508)

# 0.1.27 (October 13, 2023)

### Changed

- Bump minimum version of proc-macro2 to 1.0.60 (tokio-rs#2732)
- Generate less dead code for async block return type hint (tokio-rs#2709)

### Fixed

- Fix a compilation error in `#[instrument]` when the `"log"`
  feature is enabled (tokio-rs#2599)

# 0.1.39 (October 12, 2023)

This release adds several additional features to the `tracing` macros.
In addition, it updates the `tracing-core` dependency to
[v0.1.32][core-0.1.32] and the `tracing-attributes` dependency to
[v0.1.27][attrs-0.1.27].

### Added

- Allow constant field names in macros ([tokio-rs#2617])
- Allow setting event names in macros ([tokio-rs#2699])
- **core**: Allow `ValueSet`s of any length ([tokio-rs#2508])

### Changed

- `tracing-attributes`: updated to [0.1.27][attrs-0.1.27]
- `tracing-core`: updated to [0.1.32][core-0.1.32]
- **attributes**: Bump minimum version of proc-macro2 to 1.0.60
  ([tokio-rs#2732])
-  **attributes**: Generate less dead code for async block return type
   hint ([tokio-rs#2709])

### Fixed

- Use fully qualified names in macros for items exported from std
  prelude ([tokio-rs#2621], [tokio-rs#2757])
- **attributes**: Allow [`clippy::let_with_type_underscore`] in
  macro-generated code ([tokio-rs#2609])
- **attributes**: Allow `unknown_lints` in macro-generated code
  ([tokio-rs#2626])
- **attributes**: Fix a compilation error in `#[instrument]` when the
  `"log"` feature is enabled ([tokio-rs#2599])

### Documented

- Add `axum-insights` to relevant crates. ([tokio-rs#2713])
- Fix link to RAI pattern crate documentation ([tokio-rs#2612])
- Fix docs typos and warnings ([tokio-rs#2581])
- Add `clippy-tracing` to related crates ([tokio-rs#2628])
- Add `tracing-cloudwatch` to related crates ([tokio-rs#2667])
- Fix deadlink to `tracing-etw` repo ([tokio-rs#2602])

[tokio-rs#2617]: tokio-rs#2617
[tokio-rs#2699]: tokio-rs#2699
[tokio-rs#2508]: tokio-rs#2508
[tokio-rs#2621]: tokio-rs#2621
[tokio-rs#2713]: tokio-rs#2713
[tokio-rs#2581]: tokio-rs#2581
[tokio-rs#2628]: tokio-rs#2628
[tokio-rs#2667]: tokio-rs#2667
[tokio-rs#2602]: tokio-rs#2602
[tokio-rs#2626]: tokio-rs#2626
[tokio-rs#2757]: tokio-rs#2757
[tokio-rs#2732]: tokio-rs#2732
[tokio-rs#2709]: tokio-rs#2709
[tokio-rs#2599]: tokio-rs#2599
[`let_with_type_underscore`]: http://rust-lang.github.io/rust-clippy/rust-1.70.0/index.html#let_with_type_underscore
[attrs-0.1.27]:
    https://github.com/tokio-rs/tracing/releases/tag/tracing-attributes-0.1.27
[core-0.1.32]:
    https://github.com/tokio-rs/tracing/releases/tag/tracing-core-0.1.32

# 0.1.25 (June 19th, 2023)

This release of `tracing-attributes` fixes the Clippy lint
[`let_with_type_underscore`] in code generated by the `#[instrument]`
attribute in Rust 1.70+.

### Fixed

- Allow [`clippy::let_with_type_underscore`] in macro-generated code ([tokio-rs#2609])

Thanks to @coolreader19 for contributing to this release!

[tokio-rs#2609]: tokio-rs#2609

[`let_with_type_underscore`]: http://rust-lang.github.io/rust-clippy/rust-1.70.0/index.html#let_with_type_underscore