subscriber: prepare to release v0.3.0 (tokio-rs#1677)

# 0.3.0 (Oct 22, 2021)

This is a breaking release of `tracing-subscriber`. The primary breaking
change in this release is the removal of the dependency on the [`chrono`
crate], due to [RUSTSEC-2020-0159]. To replace `chrono`, support is
added for formatting timestamps using the [`time` crate] instead.

In addition, this release includes a number of other breaking API
changes, such as adding (limited) support for `#![no_std]` targets,
removing previously deprecated APIs, and more.

### Breaking Changes

- Removed APIs deprecated in the v0.2.x release series.
- Renamed `Layer::new_span` to `Layer::on_new_span` ([tokio-rs#1674])
- Removed `Layer` impl for `Arc<L: Layer<S>>` and `Arc<dyn Layer<S> +
  ...>` ([tokio-rs#1649])
- Replaced the [`chrono` crate] with the [`time` crate] for timestamp
  formatting, to resolve [RUSTSEC-2020-0159] ([tokio-rs#1646])
- Removed `json` and `env-filter` from default features. They must now
  be enabled explictly ([tokio-rs#1647])
- Changed `FormatEvent::format_event` and `FormatFields::format_fields`
  trait methods to take a `Writer` type, rather than a `&mut dyn
  fmt::Write` trait object ([tokio-rs#1661])
- Changed the signature of the `MakeWriter` trait by adding a lifetime
  parameter ([tokio-rs#781])
  ### Changed

- **layer**: Renamed `Layer::new_span` to `Layer::on_new_span` ([tokio-rs#1674])
- **fmt**: Changed `FormatEvent::format_event` and
  `FormatFields::format_fields` trait methods to take a `Writer` type,
  rather than a `&mut dyn fmt::Write` trait object ([tokio-rs#1661])
- **json**, **env-filter**: `json` and `env-filter` feature flags are no
  longer enabled by default ([tokio-rs#1647])
  ### Removed

- Removed deprecated `CurrentSpan` type ([tokio-rs#1320])
- **registry**: Removed deprecated `SpanRef::parents` iterator, replaced
  by `SpanRef::scope` in [tokio-rs#1431] ([tokio-rs#1648)])
- **layer**: Removed deprecated `Context::scope` iterator, replaced by
  `Context::span_scope` and `Context::event_scope` in [tokio-rs#1431] and
  [tokio-rs#1434] ([tokio-rs#1648)])
- **layer**: Removed `Layer` impl for `Arc<L: Layer<S>>` and `Arc<dyn
  Layer<S> + ...>`. These interfere with per-layer filtering. ([tokio-rs#1649])
- **fmt**: Removed deprecated `LayerBuilder` type ([tokio-rs#1673])
- **fmt**: Removed `fmt::Layer::on_event` (renamed to
  `fmt::Layer::fmt_event`) ([tokio-rs#1673])
- **fmt**, **chrono**: Removed the `chrono` feature flag and APIs for
  using the [`chrono` crate] for timestamp formatting ([tokio-rs#1646])
  ### Added

- **fmt**, **time**: `LocalTime` and `UtcTime` types for formatting
  timestamps using the [`time` crate] ([tokio-rs#1646])
- **fmt**: Added a lifetime parameter to the `MakeWriter` trait,
  allowing it to return a borrowed writer. This enables implementations
  of `MakeWriter` for types such as `Mutex<T: io::Write>` and
  `std::fs::File`. ([tokio-rs#781])
- **env-filter**: Documentation improvements ([tokio-rs#1637])
- Support for some APIs on `#![no_std]` targets, by disabling the `std`
  feature flag ([tokio-rs#1660])

Thanks to @Folyd and @nmathewson for contributing to this release!

[tokio-rs#1320]: tokio-rs#1320
[tokio-rs#1673]: tokio-rs#1673
[tokio-rs#1674]: tokio-rs#1674
[tokio-rs#1646]: tokio-rs#1646
[tokio-rs#1647]: tokio-rs#1647
[tokio-rs#1648]: tokio-rs#1648
[tokio-rs#1649]: tokio-rs#1649
[tokio-rs#1660]: tokio-rs#1660
[tokio-rs#1661]: tokio-rs#1661
[tokio-rs#1431]: tokio-rs#1431
[tokio-rs#1434]: tokio-rs#1434
[tokio-rs#781]: tokio-rs#781

[`chrono` crate]: https://crates.io/crates/chrono
[`time` crate]: https://crates.io/crates/time
[RUSTSEC-2020-0159]: https://rustsec.org/advisories/RUSTSEC-2020-0159.html

Signed-off-by: Eliza Weisman <eliza@buoyant.io>

tracing-opentelemetry/Cargo.toml

@@ -25,7 +25,7 @@ default = ["tracing-log"]
 opentelemetry = { version = "0.16", default-features = false, features = ["trace"] }
 tracing = { path = "../tracing", version = "0.1", default-features = false, features = ["std"] }
 tracing-core = { path = "../tracing-core", version = "0.1" }
-tracing-subscriber = { path = "../tracing-subscriber", version = "0.2", default-features = false, features = ["registry", "std"] }
+tracing-subscriber = { path = "../tracing-subscriber", version = "0.3", default-features = false, features = ["registry", "std"] }
 tracing-log = { path = "../tracing-log", version = "0.1", default-features = false, optional = true }
 
 [dev-dependencies]

tracing-subscriber/CHANGELOG.md

@@ -1,3 +1,82 @@
+# 0.3.0 (Oct 22, 2021)
+
+This is a breaking release of `tracing-subscriber`. The primary breaking change
+in this release is the removal of the dependency on the [`chrono` crate], due to
+[RUSTSEC-2020-0159]. To replace `chrono`, support is added for formatting
+timestamps using the [`time` crate] instead.
+
+In addition, this release includes a number of other breaking API changes, such
+as adding (limited) support for `#![no_std]` targets, removing previously
+deprecated APIs, and more.
+
+### Breaking Changes
+
+- Removed APIs deprecated in the v0.2.x release series.
+- Renamed `Layer::new_span` to `Layer::on_new_span` ([#1674])
+- Removed `Layer` impl for `Arc<L: Layer<S>>` and `Arc<dyn Layer<S> + ...>`
+  ([#1649])
+- Replaced the [`chrono` crate] with the [`time` crate] for timestamp formatting, to
+  resolve [RUSTSEC-2020-0159] ([#1646])
+- Removed `json` and `env-filter` from default features. They must now be
+  enabled explictly ([#1647])
+- Changed `FormatEvent::format_event` and `FormatFields::format_fields`
+  trait methods to take a `Writer` type, rather than a `&mut dyn fmt::Write`
+  trait object ([#1661])
+- Changed the signature of the `MakeWriter` trait by adding a lifetime parameter
+  ([#781])
+### Changed
+
+- **layer**: Renamed `Layer::new_span` to `Layer::on_new_span` ([#1674])
+- **fmt**: Changed `FormatEvent::format_event` and `FormatFields::format_fields`
+  trait methods to take a `Writer` type, rather than a `&mut dyn fmt::Write`
+  trait object ([#1661])
+- **json**, **env-filter**: `json` and `env-filter` feature flags are no longer
+  enabled by default ([#1647])
+### Removed
+
+- Removed deprecated `CurrentSpan` type ([#1320])
+- **registry**: Removed deprecated `SpanRef::parents` iterator, replaced by
+  `SpanRef::scope` in [#1431] ([#1648)])
+- **layer**: Removed deprecated `Context::scope` iterator, replaced by
+  `Context::span_scope` and `Context::event_scope` in [#1431] and [#1434]
+  ([#1648)])
+- **layer**: Removed `Layer` impl for `Arc<L: Layer<S>>` and
+   `Arc<dyn Layer<S> + ...>`. These interfere with per-layer filtering. ([#1649])
+- **fmt**: Removed deprecated `LayerBuilder` type ([#1673])
+- **fmt**: Removed `fmt::Layer::on_event` (renamed to `fmt::Layer::fmt_event`)
+  ([#1673])
+- **fmt**, **chrono**: Removed the `chrono` feature flag and APIs for using the
+  [`chrono` crate] for timestamp formatting ([#1646])
+### Added
+
+- **fmt**, **time**: `LocalTime` and `UtcTime` types for formatting timestamps
+  using the [`time` crate] ([#1646])
+- **fmt**: Added a lifetime parameter to the `MakeWriter` trait, allowing it to
+  return a borrowed writer. This enables implementations of `MakeWriter` for
+  types such as `Mutex<T: io::Write>` and `std::fs::File`. ([#781])
+- **env-filter**: Documentation improvements ([#1637])
+- Support for some APIs on `#![no_std]` targets, by disabling the `std` feature
+  flag ([#1660])
+
+Thanks to @Folyd and @nmathewson for contributing to this release!
+
+[#1320]: https://github.com/tokio-rs/tracing/pull/1320
+[#1673]: https://github.com/tokio-rs/tracing/pull/1673
+[#1674]: https://github.com/tokio-rs/tracing/pull/1674
+[#1646]: https://github.com/tokio-rs/tracing/pull/1646
+[#1647]: https://github.com/tokio-rs/tracing/pull/1647
+[#1648]: https://github.com/tokio-rs/tracing/pull/1648
+[#1649]: https://github.com/tokio-rs/tracing/pull/1649
+[#1660]: https://github.com/tokio-rs/tracing/pull/1660
+[#1661]: https://github.com/tokio-rs/tracing/pull/1661
+[#1431]: https://github.com/tokio-rs/tracing/pull/1431
+[#1434]: https://github.com/tokio-rs/tracing/pull/1434
+[#781]: https://github.com/tokio-rs/tracing/pull/781
+
+[`chrono` crate]: https://crates.io/crates/chrono
+[`time` crate]: https://crates.io/crates/time
+[RUSTSEC-2020-0159]: https://rustsec.org/advisories/RUSTSEC-2020-0159.html
+
 # 0.2.25 (October 5, 2021)
 
 This release fixes an issue where a `Layer` implementation's custom

tracing/README.md

@@ -62,7 +62,7 @@ idiomatic `tracing`.)
 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`](https://docs.rs/tracing-subscriber/)'s
-[`fmt` module](https://docs.rs/tracing-subscriber/0.2.0-alpha.2/tracing_subscriber/fmt/index.html) provides reasonable defaults.
+[`fmt` module](https://docs.rs/tracing-subscriber/0.3/tracing_subscriber/fmt/index.html) provides reasonable defaults.
 Additionally, `tracing-subscriber` is able to consume messages emitted by `log`-instrumented libraries and modules.
 
 The simplest way to use a subscriber is to call the `set_global_default` function.