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subscriber: prepare to release 0.2.21
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# 0.2.21 (September 12, 2021)

This release introduces the [`Filter`] trait, a new API for [per-layer
filtering][plf]. This allows controlling which spans and events are
recorded by various layers individually, rather than globally.

In addition, it adds a new [`Targets`] filter, which provides a
lighter-weight version of the filtering provided by [`EnvFilter`], as
well as other smaller API improvements and fixes.

### Deprecated

- **registry**: `SpanRef::parent_id`, which cannot properly support
  per-layer filtering. Use `.parent().map(SpanRef::id)` instead.
  ([#1523])

### Fixed

- **layer** `Context` methods that are provided when the `Subscriber`
  implements `LookupSpan` no longer require the "registry" feature flag
  ([#1525])
- **layer** `fmt::Debug` implementation for `Layered` no longer requires
  the `S` type parameter to implement `Debug` ([#1528])

### Added

- **registry**: `Filter` trait, `Filtered` type, `Layer::with_filter`
  method, and other APIs for per-layer filtering ([#1523])
- **filter**: `FilterFn` and `DynFilterFn` types that implement global
  (`Layer`) and per-layer (`Filter`) filtering for closures and function
  pointers ([#1523])
- **filter**: `Targets` filter, which implements a lighter-weight form
  of `EnvFilter`-like filtering ([#1550])
- **env-filter**: Added support for filtering on floating-point values
  ([#1507])
- **layer**: `Layer::on_layer` callback, called when layering the
  `Layer` onto a `Subscriber` ([#1523])
- **layer**: `Layer` implementations for `Box<L>` and `Arc<L>` where `L:
  Layer` ([#1536])
- **layer**: `Layer` implementations for `Box<dyn Layer<S> + Send + Sync
  + 'static>` and `Arc<dyn Layer<S> + Send + Sync + 'static>` ([#1536])
- A number of small documentation fixes and improvements ([#1553],
  [#1544], [#1539], [#1524])

Special thanks to new contributors @jsgf and @maxburke for contributing
to this release!

[`Filter`]: https://docs.rs/tracing-subscriber/0.2.21/tracing_subscriber/layer/trait.Filter.html
[`plf`]: https://docs.rs/tracing-subscriber/0.2.21/tracing_subscriber/layer/index.html#per-layer-filtering
[`Targets`]: https://docs.rs/tracing-subscriber/0.2.21/tracing_subscriber/filter/struct.Targets.html
[`EnvFilter`]: https://docs.rs/tracing-subscriber/0.2.21/tracing_subscriber/filter/struct.EnvFilter.html
[#1507]: #1507
[#1523]: #1523
[#1524]: #1524
[#1525]: #1525
[#1528]: #1528
[#1539]: #1539
[#1544]: #1544
[#1550]: #1550
[#1553]: #1553
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@hawkw
hawkw committed Sep 12, 2021
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51 changes: 50 additions & 1 deletion tracing-subscriber/CHANGELOG.md
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# Unreleased
# 0.2.21 (September 12, 2021)

This release introduces the [`Filter`] trait, a new API for [per-layer
filtering][plf]. This allows controlling which spans and events are recorded by
various layers individually, rather than globally.

In addition, it adds a new [`Targets`] filter, which provides a lighter-weight
version of the filtering provided by [`EnvFilter`], as well as other smaller API
improvements and fixes.

### Deprecated

- **registry**: `SpanRef::parent_id`, which cannot properly support per-layer
filtering. Use `.parent().map(SpanRef::id)` instead. ([#1523])

### Fixed

- **layer** `Context` methods that are provided when the `Subscriber` implements
`LookupSpan` no longer require the "registry" feature flag ([#1525])
- **layer** `fmt::Debug` implementation for `Layered` no longer requires the `S`
type parameter to implement `Debug` ([#1528])

### Added

- **registry**: `Filter` trait, `Filtered` type, `Layer::with_filter` method,
and other APIs for per-layer filtering ([#1523])
- **filter**: `FilterFn` and `DynFilterFn` types that implement global (`Layer`)
and per-layer (`Filter`) filtering for closures and function pointers
([#1523])
- **filter**: `Targets` filter, which implements a lighter-weight form of
`EnvFilter`-like filtering ([#1550])
- **env-filter**: Added support for filtering on floating-point values ([#1507])
- **layer**: `Layer::on_layer` callback, called when layering the `Layer` onto a
`Subscriber` ([#1523])
- **layer**: `Layer` implementations for `Box<L>` and `Arc<L>` where `L: Layer`
([#1536])
- **layer**: `Layer` implementations for `Box<dyn Layer<S> + Send + Sync + 'static>`
and `Arc<dyn Layer<S> + Send + Sync + 'static>` ([#1536])
- A number of small documentation fixes and improvements ([#1553], [#1544],
[#1539], [#1524])

Special thanks to new contributors @jsgf and @maxburke for contributing to this
release!

[`Filter`]: https://docs.rs/tracing-subscriber/0.2.21/tracing_subscriber/layer/trait.Filter.html
[plf]: https://docs.rs/tracing-subscriber/0.2.21/tracing_subscriber/layer/index.html#per-layer-filtering
[`Targets`]: https://docs.rs/tracing-subscriber/0.2.21/tracing_subscriber/filter/struct.Targets.html
[`EnvFilter`]: https://docs.rs/tracing-subscriber/0.2.21/tracing_subscriber/filter/struct.EnvFilter.html
[#1507]: https://github.com/tokio-rs/tracing/pull/1507
[#1523]: https://github.com/tokio-rs/tracing/pull/1523
[#1524]: https://github.com/tokio-rs/tracing/pull/1524
[#1525]: https://github.com/tokio-rs/tracing/pull/1525
[#1528]: https://github.com/tokio-rs/tracing/pull/1528
[#1539]: https://github.com/tokio-rs/tracing/pull/1539
[#1544]: https://github.com/tokio-rs/tracing/pull/1544
[#1550]: https://github.com/tokio-rs/tracing/pull/1550
[#1553]: https://github.com/tokio-rs/tracing/pull/1553

# 0.2.20 (August 17, 2021)

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4 changes: 2 additions & 2 deletions tracing-subscriber/Cargo.toml
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[package]
name = "tracing-subscriber"
version = "0.2.20"
version = "0.2.21"
authors = [
"Eliza Weisman <eliza@buoyant.io>",
"David Barsky <me@davidbarsky.com>",
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json = ["tracing-serde", "serde", "serde_json"]

[dependencies]
tracing-core = { path = "../tracing-core", version = "0.1.17" }
tracing-core = { path = "../tracing-core", version = "0.1.20" }

# only required by the filter feature
tracing = { optional = true, path = "../tracing", version = "0.1", default-features = false, features = ["std"] }
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2 changes: 1 addition & 1 deletion tracing-subscriber/src/lib.rs
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//! [`env_logger` crate]: https://crates.io/crates/env_logger
//! [`parking_lot`]: https://crates.io/crates/parking_lot
//! [`registry`]: registry/index.html
#![doc(html_root_url = "https://docs.rs/tracing-subscriber/0.2.20")]
#![doc(html_root_url = "https://docs.rs/tracing-subscriber/0.2.21")]
#![doc(
html_logo_url = "https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png",
issue_tracker_base_url = "https://github.com/tokio-rs/tracing/issues/"
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