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More layer modification #2034

Merged

hawkw merged 1 commit into tokio-rs:master from wagenet:more-layer-modification

Mar 31, 2022

Contributor

wagenet commented Mar 30, 2022

This adds more modification methods for use with reloading. Replaces #2032.

Needs fixes in doc tests.

Motivation

I have a Filtered layer that I'd like to modify with a reload handle. If I use reload then the filter doesn't work. If I use modify with filter_mut I can't update the writer.

Solution

Adds some additional accessor methods to allow the writer to be modified in modify.

wagenet requested review from hawkw, davidbarsky and a team as code owners

March 30, 2022 00:39

davidbarsky requested changes

View reviewed changes

Member

davidbarsky left a comment

I added some grammatical fixes, but naively, I think that these examples would be better placed on reload with the docs here linking to those?

tracing-subscriber/src/filter/subscriber_filters/mod.rs Outdated

+                      &self.subscriber
+                  }
+                  /// Mutably borrows the underlying [`Subscribe`] that is being filtered.

Member

davidbarsky Mar 30, 2022

Suggested change

      
                /// Mutably borrows the underlying [`Subscribe`] that is being filtered.
          
                /// Returns a mutable borrow to the wrapped [`Subscribe`].

Contributor Author

wagenet Mar 30, 2022

@davidbarsky I just copied the wording from filter_mut. I agree that it could be more natural, but went for consistency.

Member

hawkw Mar 30, 2022

how about:

Suggested change

      
                /// Mutably borrows the underlying [`Subscribe`] that is being filtered.
          
                /// Mutably borrows the inner [subscriber] wrapped by this `Filtered` subscriber.
          
                ///
          
                /// [subscriber]: Subscribe

Contributor Author

wagenet Mar 30, 2022

Updated.

tracing-subscriber/src/filter/subscriber_filters/mod.rs Outdated

@@ @@ -499,6 +499,41 @@ impl<S, F, C> Filtered<S, F, C> { @@
                   pub fn filter_mut(&mut self) -> &mut F {
                       &mut self.filter
                   }
+                  /// Borrows the underlying [`Subscribe`] that is being filtered.

Member

davidbarsky Mar 30, 2022

Suggested change

      
                /// Borrows the underlying [`Subscribe`] that is being filtered.
          
                /// Returns a borrow to the wrapped [`Subscribe`].

Member

hawkw Mar 30, 2022

personally I prefer "Borrows" over "Returns a borrow to", but I agree that "that is being filtered" is awkward. How about

Suggested change

      
                /// Borrows the underlying [`Subscribe`] that is being filtered.
          
                /// Borrows the inner [subscriber] wrapped by this `Filtered` subscriber.
          
                ///
          
                /// [subscriber]: Subscribe

Contributor Author

wagenet Mar 30, 2022

Updated.

tracing-subscriber/src/filter/subscriber_filters/mod.rs Outdated

Comment on lines 510 to 514

+                  /// When this subscriber can be mutably borrowed, this may be used to mutate the underlying
+                  /// subsrcribe. Generally, this will primarily be used with the
+                  /// [`reload::Handle::modify`](crate::reload::Handle::modify) method.
+                  ///
+                  /// # Examples

Member

davidbarsky Mar 30, 2022

Suggested change

      
                /// When this subscriber can be mutably borrowed, this may be used to mutate the underlying
          
                /// subsrcribe. Generally, this will primarily be used with the
          
                /// [`reload::Handle::modify`](crate::reload::Handle::modify) method.
          
                ///
          
                /// # Examples
          
                /// This method is primarily expected to be used with the
          
                /// [`reload::Handle::modify`](crate::reload::Handle::modify) method. For example:
          
                ///

Contributor Author

wagenet Mar 30, 2022

Updated.

wagenet force-pushed the more-layer-modification branch from 2d5d3e5 to 097b448 Compare

March 30, 2022 15:44

hawkw requested changes

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Member

hawkw left a comment

Some documentation and naming suggestions, let me know what you think!

tracing-subscriber/src/filter/subscriber_filters/mod.rs Outdated

@@ @@ -499,6 +499,41 @@ impl<S, F, C> Filtered<S, F, C> { @@
                   pub fn filter_mut(&mut self) -> &mut F {
                       &mut self.filter
                   }
+                  /// Borrows the underlying [`Subscribe`] that is being filtered.

Member

hawkw Mar 30, 2022

personally I prefer "Borrows" over "Returns a borrow to", but I agree that "that is being filtered" is awkward. How about

Suggested change

      
                /// Borrows the underlying [`Subscribe`] that is being filtered.
          
                /// Borrows the inner [subscriber] wrapped by this `Filtered` subscriber.
          
                ///
          
                /// [subscriber]: Subscribe

tracing-subscriber/src/filter/subscriber_filters/mod.rs Outdated

@@ @@ -499,6 +499,43 @@ impl<S, F, C> Filtered<S, F, C> { @@
                   pub fn filter_mut(&mut self) -> &mut F {
                       &mut self.filter
                   }
+                  /// Borrows the underlying [`Subscribe`] that is being filtered.
+                  pub fn wrapped(&self) -> &S {

Member

hawkw Mar 30, 2022

Personally, I really don't love the name wrapped; I would probably call this either inner (for consistency with std, which tends to call the type wrapped by a wrapper type inner and has methods like inner_mut(), into_inner(), etc), or subscriber (the most descriptive IMO, also the name of the field). WDYT?

cc @davidbarsky

Member

davidbarsky Mar 30, 2022

Yeah, I think inner is a better option.

Contributor Author

wagenet Mar 30, 2022

Done!

tracing-subscriber/src/filter/subscriber_filters/mod.rs Outdated

+                  /// info!("This will be logged to stdout");
+                  /// # }
+                  /// ```
+                  pub fn wrapped_mut(&mut self) -> &mut S {

Member

hawkw Mar 30, 2022

again, I would probably call this inner_mut or subscriber_mut...

Contributor Author

wagenet Mar 30, 2022

Done!

tracing-subscriber/src/filter/subscriber_filters/mod.rs Outdated

+                  /// Mutably borrows the underlying [`Subscribe`] that is being filtered.
+                  ///
+                  /// When this subscriber can be mutably borrowed, this may be used to mutate the underlying
+                  /// subsrcribe. Generally, this will primarily be used with the

Member

hawkw Mar 30, 2022

Suggested change

      
                /// subsrcribe. Generally, this will primarily be used with the
          
                /// subscriber. Generally, this will primarily be used with the

Contributor Author

wagenet Mar 30, 2022

Fixed

tracing-subscriber/src/filter/subscriber_filters/mod.rs Outdated

+                      &self.subscriber
+                  }
+                  /// Mutably borrows the underlying [`Subscribe`] that is being filtered.

Member

hawkw Mar 30, 2022

how about:

Suggested change

      
                /// Mutably borrows the underlying [`Subscribe`] that is being filtered.
          
                /// Mutably borrows the inner [subscriber] wrapped by this `Filtered` subscriber.
          
                ///
          
                /// [subscriber]: Subscribe

wagenet force-pushed the more-layer-modification branch 2 times, most recently from 5d53aaf to 449308f Compare

March 30, 2022 20:03

wagenet requested review from davidbarsky and hawkw

March 30, 2022 20:03

wagenet force-pushed the more-layer-modification branch 3 times, most recently from fdefd21 to 71d55ce Compare

March 30, 2022 20:07

hawkw reviewed

View reviewed changes

Member

hawkw left a comment

one last suggestion for the documentation

tracing-subscriber/src/fmt/fmt_subscriber.rs Outdated Show resolved Hide resolved

wagenet force-pushed the more-layer-modification branch from 3923b8f to dc374df Compare

March 30, 2022 21:43


          Add more subscriber modification methods

9882b08

* Filtered::inner
* Filtered::inner_mut
* format::Subscriber::writer
* format::Subscriber::writer_mut
* format::Subscriber::set_ansi

wagenet force-pushed the more-layer-modification branch from dc374df to 9882b08 Compare

March 30, 2022 21:44

wagenet requested a review from hawkw

March 30, 2022 21:44

hawkw approved these changes

View reviewed changes

Member

hawkw left a comment

looks good to me --- @davidbarsky wanna give the docs a last look?

Member

hawkw commented Mar 30, 2022

@wagenet btw, you don't need to force-push changes to your branches, we'll squash the entire branch prior to merging anyway, so it's fine to make a series of messy work-in-progress commits: https://github.com/tokio-rs/tracing/blob/master/CONTRIBUTING.md#commit-squashing

Contributor Author

wagenet commented Mar 31, 2022

@hawkw thanks for letting me know. I'd missed that.

davidbarsky approved these changes

View reviewed changes

hawkw merged commit 7d29447 into tokio-rs:master

wagenet deleted the more-layer-modification branch

March 31, 2022 18:34

hawkw pushed a commit that referenced this pull request


          subscriber: Add Filtered and fmt::Layer accessors (#2034)

bd7755f

This adds more modification methods for use with reloading. Replaces
#2032.

## Motivation

I have a `Filtered` layer that I'd like to modify with a reload handle. If
I use `reload` then the filter doesn't work. If I use `modify` with
`filter_mut` I can't update the writer.

## Solution

Adds some additional accessor methods to allow the writer to be modified
in `modify`:

* `Filtered::inner`
* `Filtered::inner_mut`
* `fmt::Layer::writer`
* `fmt::Layer::writer_mut`
* `fmt::Layer::set_ansi`

hawkw pushed a commit that referenced this pull request


          subscriber: Add Filtered and fmt::Layer accessors (#2034)

a4f9b1a

This adds more modification methods for use with reloading. Replaces
#2032.

## Motivation

I have a `Filtered` layer that I'd like to modify with a reload handle. If
I use `reload` then the filter doesn't work. If I use `modify` with
`filter_mut` I can't update the writer.

## Solution

Adds some additional accessor methods to allow the writer to be modified
in `modify`:

* `Filtered::inner`
* `Filtered::inner_mut`
* `fmt::Layer::writer`
* `fmt::Layer::writer_mut`
* `fmt::Layer::set_ansi`

hawkw pushed a commit that referenced this pull request


          subscriber: Add Filtered and fmt::Layer accessors (#2034)

a268ec8

This adds more modification methods for use with reloading. Replaces
#2032.

## Motivation

I have a `Filtered` layer that I'd like to modify with a reload handle. If
I use `reload` then the filter doesn't work. If I use `modify` with
`filter_mut` I can't update the writer.

## Solution

Adds some additional accessor methods to allow the writer to be modified
in `modify`:

* `Filtered::inner`
* `Filtered::inner_mut`
* `fmt::Layer::writer`
* `fmt::Layer::writer_mut`
* `fmt::Layer::set_ansi`

hawkw pushed a commit that referenced this pull request


          subscriber: Add Filtered and fmt::Layer accessors (#2034)

b1977ea

This adds more modification methods for use with reloading. Replaces
#2032.

## Motivation

I have a `Filtered` layer that I'd like to modify with a reload handle. If
I use `reload` then the filter doesn't work. If I use `modify` with
`filter_mut` I can't update the writer.

## Solution

Adds some additional accessor methods to allow the writer to be modified
in `modify`:

* `Filtered::inner`
* `Filtered::inner_mut`
* `fmt::Layer::writer`
* `fmt::Layer::writer_mut`
* `fmt::Layer::set_ansi`

hawkw added a commit that referenced this pull request


          subscriber: prepare to release v0.3.10

2a8eab8

# 0.3.10 (Apr 1, 2022)

This release adds several new features, including a `Filter`
implementation and new builder API for `EnvFilter`, support for using a
`Vec<L> where L: Layer` as a `Layer`, and a number of smaller API
improvements to make working with dynamic and reloadable layers easier.

### Added

- **registry**: Implement `Filter` for `EnvFilter`, allowing it to be
  used with per-layer filtering ([#1983])
  - **registry**: `Filter::on_new_span`, `Filter::on_enter`,
  `Filter::on_exit`, `Filter::on_close` and `Filter::on_record`
  callbacks to allow `Filter`s to track span states internally ([#1973],
  [#2017], [#2031])
- **registry**: `Filtered::filter` and `Filtered::filter_mut` accessors
  ([#1959])
- **registry**: `Filtered::inner` and `Filtered::inner_mut` accessors to
  borrow the wrapped `Layer` ([#2034])
- **layer**: Implement `Layer` for `Vec<L: Layer>`, to allow composing
  together a dynamically sized list of `Layer`s ([#2027])
- **layer**: `Layer::boxed` method to make type-erasing `Layer`s easier
  ([#2026])
- **fmt**: `fmt::Layer::writer` and `fmt::Layer::writer_mut` accessors
  ([#2034])
- **fmt**: `fmt::Layer::set_ansi` method to allow changing the ANSI
  formatting configuration at runtime ([#2034])
- **env-filter**: `EnvFilter::builder` to configure a new `EnvFilter`
  prior to parsing it ([#2035])
- Several documentation fixes and improvements ([#1972], [#1971],
  [#2023], [#2023])

### Fixed

- **fmt**: `fmt::Layer`'s auto traits no longer depend on the
  `Subscriber` type parameter's auto traits ([2025])
- **env-filter**: Fixed missing help text when the `ansi` feature is
  disabled ([#2029])

Thanks to new contributors @TimoFreiberg and @wagenet, as well as @CAD97
for contributing to this release!

[#1983]: #1983
[#1973]: #1973
[#2017]: #2017
[#2031]: #2031
[#1959]: #1959
[#2034]: #2034
[#2027]: #2027
[#2026]: #2026
[#2035]: #2035
[#1972]: #1972
[#1971]: #1971
[#2023]: #2023

hawkw mentioned this pull request

subscriber: prepare to release v0.3.10 #2041

Merged

hawkw added a commit that referenced this pull request


          subscriber: prepare to release v0.3.10

# 0.3.10 (Apr 1, 2022)

This release adds several new features, including a `Filter`
implementation and new builder API for `EnvFilter`, support for using a
`Vec<L> where L: Layer` as a `Layer`, and a number of smaller API
improvements to make working with dynamic and reloadable layers easier.

### Added

- **registry**: Implement `Filter` for `EnvFilter`, allowing it to be
  used with per-layer filtering ([#1983])
  - **registry**: `Filter::on_new_span`, `Filter::on_enter`,
  `Filter::on_exit`, `Filter::on_close` and `Filter::on_record`
  callbacks to allow `Filter`s to track span states internally ([#1973],
  [#2017], [#2031])
- **registry**: `Filtered::filter` and `Filtered::filter_mut` accessors
  ([#1959])
- **registry**: `Filtered::inner` and `Filtered::inner_mut` accessors to
  borrow the wrapped `Layer` ([#2034])
- **layer**: Implement `Layer` for `Vec<L: Layer>`, to allow composing
  together a dynamically sized list of `Layer`s ([#2027])
- **layer**: `Layer::boxed` method to make type-erasing `Layer`s easier
  ([#2026])
- **fmt**: `fmt::Layer::writer` and `fmt::Layer::writer_mut` accessors
  ([#2034])
- **fmt**: `fmt::Layer::set_ansi` method to allow changing the ANSI
  formatting configuration at runtime ([#2034])
- **env-filter**: `EnvFilter::builder` to configure a new `EnvFilter`
  prior to parsing it ([#2035])
- Several documentation fixes and improvements ([#1972], [#1971],
  [#2023], [#2023])

### Fixed

- **fmt**: `fmt::Layer`'s auto traits no longer depend on the
  `Subscriber` type parameter's auto traits ([2025])
- **env-filter**: Fixed missing help text when the `ansi` feature is
  disabled ([#2029])

Thanks to new contributors @TimoFreiberg and @wagenet, as well as @CAD97
for contributing to this release!

[#1983]: #1983
[#1973]: #1973
[#2017]: #2017
[#2031]: #2031
[#1959]: #1959
[#2034]: #2034
[#2027]: #2027
[#2026]: #2026
[#2035]: #2035
[#1972]: #1972
[#1971]: #1971
[#2023]: #2023

hawkw added a commit that referenced this pull request


          subscriber: prepare to release v0.3.10

ec96350

# 0.3.10 (Apr 1, 2022)

This release adds several new features, including a `Filter`
implementation and new builder API for `EnvFilter`, support for using a
`Vec<L> where L: Layer` as a `Layer`, and a number of smaller API
improvements to make working with dynamic and reloadable layers easier.

### Added

- **registry**: Implement `Filter` for `EnvFilter`, allowing it to be
  used with per-layer filtering ([#1983])
  - **registry**: `Filter::on_new_span`, `Filter::on_enter`,
  `Filter::on_exit`, `Filter::on_close` and `Filter::on_record`
  callbacks to allow `Filter`s to track span states internally ([#1973],
  [#2017], [#2031])
- **registry**: `Filtered::filter` and `Filtered::filter_mut` accessors
  ([#1959])
- **registry**: `Filtered::inner` and `Filtered::inner_mut` accessors to
  borrow the wrapped `Layer` ([#2034])
- **layer**: Implement `Layer` for `Vec<L: Layer>`, to allow composing
  together a dynamically sized list of `Layer`s ([#2027])
- **layer**: `Layer::boxed` method to make type-erasing `Layer`s easier
  ([#2026])
- **fmt**: `fmt::Layer::writer` and `fmt::Layer::writer_mut` accessors
  ([#2034])
- **fmt**: `fmt::Layer::set_ansi` method to allow changing the ANSI
  formatting configuration at runtime ([#2034])
- **env-filter**: `EnvFilter::builder` to configure a new `EnvFilter`
  prior to parsing it ([#2035])
- Several documentation fixes and improvements ([#1972], [#1971],
  [#2023], [#2023])

### Fixed

- **fmt**: `fmt::Layer`'s auto traits no longer depend on the
  `Subscriber` type parameter's auto traits ([2025])
- **env-filter**: Fixed missing help text when the `ansi` feature is
  disabled ([#2029])

Thanks to new contributors @TimoFreiberg and @wagenet, as well as @CAD97
for contributing to this release!

[#1983]: #1983
[#1973]: #1973
[#2017]: #2017
[#2031]: #2031
[#1959]: #1959
[#2034]: #2034
[#2027]: #2027
[#2026]: #2026
[#2035]: #2035
[#1972]: #1972
[#1971]: #1971
[#2023]: #2023

hawkw added a commit that referenced this pull request


          subscriber: prepare to release v0.3.10

c14a60d

# 0.3.10 (Apr 1, 2022)

This release adds several new features, including a `Filter`
implementation and new builder API for `EnvFilter`, support for using a
`Vec<L> where L: Layer` as a `Layer`, and a number of smaller API
improvements to make working with dynamic and reloadable layers easier.

### Added

- **registry**: Implement `Filter` for `EnvFilter`, allowing it to be
  used with per-layer filtering ([#1983])
  - **registry**: `Filter::on_new_span`, `Filter::on_enter`,
  `Filter::on_exit`, `Filter::on_close` and `Filter::on_record`
  callbacks to allow `Filter`s to track span states internally ([#1973],
  [#2017], [#2031])
- **registry**: `Filtered::filter` and `Filtered::filter_mut` accessors
  ([#1959])
- **registry**: `Filtered::inner` and `Filtered::inner_mut` accessors to
  borrow the wrapped `Layer` ([#2034])
- **layer**: Implement `Layer` for `Vec<L: Layer>`, to allow composing
  together a dynamically sized list of `Layer`s ([#2027])
- **layer**: `Layer::boxed` method to make type-erasing `Layer`s easier
  ([#2026])
- **fmt**: `fmt::Layer::writer` and `fmt::Layer::writer_mut` accessors
  ([#2034])
- **fmt**: `fmt::Layer::set_ansi` method to allow changing the ANSI
  formatting configuration at runtime ([#2034])
- **env-filter**: `EnvFilter::builder` to configure a new `EnvFilter`
  prior to parsing it ([#2035])
- Several documentation fixes and improvements ([#1972], [#1971],
  [#2023], [#2023])

### Fixed

- **fmt**: `fmt::Layer`'s auto traits no longer depend on the
  `Subscriber` type parameter's auto traits ([2025])
- **env-filter**: Fixed missing help text when the `ansi` feature is
  disabled ([#2029])

Thanks to new contributors @TimoFreiberg and @wagenet, as well as @CAD97
for contributing to this release!

[#1983]: #1983
[#1973]: #1973
[#2017]: #2017
[#2031]: #2031
[#1959]: #1959
[#2034]: #2034
[#2027]: #2027
[#2026]: #2026
[#2035]: #2035
[#1972]: #1972
[#1971]: #1971
[#2023]: #2023

hawkw added a commit that referenced this pull request


          subscriber: prepare to release v0.3.10 (#2041)

42888dc

# 0.3.10 (Apr 1, 2022)

This release adds several new features, including a `Filter`
implementation and new builder API for `EnvFilter`, support for using a
`Vec<L> where L: Layer` as a `Layer`, and a number of smaller API
improvements to make working with dynamic and reloadable layers easier.

### Added

- **registry**: Implement `Filter` for `EnvFilter`, allowing it to be
  used with per-layer filtering ([#1983])
- **registry**: `Filter::on_new_span`, `Filter::on_enter`,
  `Filter::on_exit`, `Filter::on_close` and `Filter::on_record`
  callbacks to allow `Filter`s to track span states internally ([#1973],
  [#2017], [#2031])
- **registry**: `Filtered::filter` and `Filtered::filter_mut` accessors
  ([#1959])
- **registry**: `Filtered::inner` and `Filtered::inner_mut` accessors to
  borrow the wrapped `Layer` ([#2034])
- **layer**: Implement `Layer` for `Vec<L: Layer>`, to allow composing
  together a dynamically sized list of `Layer`s ([#2027])
- **layer**: `Layer::boxed` method to make type-erasing `Layer`s easier
  ([#2026])
- **fmt**: `fmt::Layer::writer` and `fmt::Layer::writer_mut` accessors
  ([#2034])
- **fmt**: `fmt::Layer::set_ansi` method to allow changing the ANSI
  formatting configuration at runtime ([#2034])
- **env-filter**: `EnvFilter::builder` to configure a new `EnvFilter`
  prior to parsing it ([#2035])
- Several documentation fixes and improvements ([#1972], [#1971],
  [#2023], [#2023])

### Fixed

- **fmt**: `fmt::Layer`'s auto traits no longer depend on the
  `Subscriber` type parameter's auto traits ([#2025])
- **env-filter**: Fixed missing help text when the `ansi` feature is
  disabled ([#2029])

Thanks to new contributors @TimoFreiberg and @wagenet, as well as @CAD97
for contributing to this release!

[#1983]: #1983
[#1973]: #1973
[#2017]: #2017
[#2031]: #2031
[#1959]: #1959
[#2034]: #2034
[#2027]: #2027
[#2026]: #2026
[#2035]: #2035
[#1972]: #1972
[#1971]: #1971
[#2023]: #2023
[#2025]: #2025
[#2029]: #2029

davidbarsky mentioned this pull request

chore: backport roughly a year's worth of changes #2728

Merged

kaffarell pushed a commit to kaffarell/tracing that referenced this pull request


          subscriber: Add Filtered and fmt::Layer accessors (tokio-rs#2034)

bccb279

This adds more modification methods for use with reloading. Replaces
tokio-rs#2032.

## Motivation

I have a `Filtered` layer that I'd like to modify with a reload handle. If
I use `reload` then the filter doesn't work. If I use `modify` with
`filter_mut` I can't update the writer.

## Solution

Adds some additional accessor methods to allow the writer to be modified
in `modify`:

* `Filtered::inner`
* `Filtered::inner_mut`
* `fmt::Layer::writer`
* `fmt::Layer::writer_mut`
* `fmt::Layer::set_ansi`

kaffarell pushed a commit to kaffarell/tracing that referenced this pull request


          subscriber: prepare to release v0.3.10 (tokio-rs#2041)

cdfbda5

# 0.3.10 (Apr 1, 2022)

This release adds several new features, including a `Filter`
implementation and new builder API for `EnvFilter`, support for using a
`Vec<L> where L: Layer` as a `Layer`, and a number of smaller API
improvements to make working with dynamic and reloadable layers easier.

### Added

- **registry**: Implement `Filter` for `EnvFilter`, allowing it to be
  used with per-layer filtering ([tokio-rs#1983])
- **registry**: `Filter::on_new_span`, `Filter::on_enter`,
  `Filter::on_exit`, `Filter::on_close` and `Filter::on_record`
  callbacks to allow `Filter`s to track span states internally ([tokio-rs#1973],
  [tokio-rs#2017], [tokio-rs#2031])
- **registry**: `Filtered::filter` and `Filtered::filter_mut` accessors
  ([tokio-rs#1959])
- **registry**: `Filtered::inner` and `Filtered::inner_mut` accessors to
  borrow the wrapped `Layer` ([tokio-rs#2034])
- **layer**: Implement `Layer` for `Vec<L: Layer>`, to allow composing
  together a dynamically sized list of `Layer`s ([tokio-rs#2027])
- **layer**: `Layer::boxed` method to make type-erasing `Layer`s easier
  ([tokio-rs#2026])
- **fmt**: `fmt::Layer::writer` and `fmt::Layer::writer_mut` accessors
  ([tokio-rs#2034])
- **fmt**: `fmt::Layer::set_ansi` method to allow changing the ANSI
  formatting configuration at runtime ([tokio-rs#2034])
- **env-filter**: `EnvFilter::builder` to configure a new `EnvFilter`
  prior to parsing it ([tokio-rs#2035])
- Several documentation fixes and improvements ([tokio-rs#1972], [tokio-rs#1971],
  [tokio-rs#2023], [tokio-rs#2023])

### Fixed

- **fmt**: `fmt::Layer`'s auto traits no longer depend on the
  `Subscriber` type parameter's auto traits ([tokio-rs#2025])
- **env-filter**: Fixed missing help text when the `ansi` feature is
  disabled ([tokio-rs#2029])

Thanks to new contributors @TimoFreiberg and @wagenet, as well as @CAD97
for contributing to this release!

[tokio-rs#1983]: tokio-rs#1983
[tokio-rs#1973]: tokio-rs#1973
[tokio-rs#2017]: tokio-rs#2017
[tokio-rs#2031]: tokio-rs#2031
[tokio-rs#1959]: tokio-rs#1959
[tokio-rs#2034]: tokio-rs#2034
[tokio-rs#2027]: tokio-rs#2027
[tokio-rs#2026]: tokio-rs#2026
[tokio-rs#2035]: tokio-rs#2035
[tokio-rs#1972]: tokio-rs#1972
[tokio-rs#1971]: tokio-rs#1971
[tokio-rs#2023]: tokio-rs#2023
[tokio-rs#2025]: tokio-rs#2025
[tokio-rs#2029]: tokio-rs#2029

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