# 0.27.0 (October 9, 2024)

### Breaking Changes

- Upgrade to opentelemetry 0.26. Refer to the upstream
  [changelog](https://github.com/open-telemetry/opentelemetry-rust/releases/tag/opentelemetry-0.26.0)
  for more information.

# 0.26.0 (September 10, 2024)

### Breaking Changes

- Upgrade to opentelemetry 0.25. Refer to the upstream
  [changelog](https://github.com/open-telemetry/opentelemetry-rust/releases/tag/opentelemetry-0.25.0)
  for more information.

# 0.25.0 (July 21, 2024)

### Breaking Changes

- Upgrade to opentelemetry 0.24. Refer to the upstream
  [changelog](https://github.com/open-telemetry/opentelemetry-rust/releases/tag/opentelemetry-0.24.0)
  for more information.

### Fixed

- Invalidate sample decision on set parent (#153)
- chore: fix on_close() comment (#148)

# 0.24.0 (May 24, 2024)

### Breaking Changes

- Upgrade to opentelemetry 0.23. Refer to the upstream
  [changelog](https://github.com/open-telemetry/opentelemetry-rust/releases/tag/opentelemetry-0.23.0)
  for more information.

### Added

- Added gauge metrics (#129)

### Fixed

- Fixed compilation on WASI targets (#147)
- Set span end time when it exists (#124)

# 0.23.0 (February 26, 2024)

### Breaking Changes

- Upgrade to opentelemetry 0.22. Refer to the upstream
  [changelog](https://github.com/open-telemetry/opentelemetry-rust/releases/tag/v0.22.0)
  for more information. In particular, i64 histograms will silently downgrade to
  key/value exports.

# 0.22.0 (November 7, 2023)

### Breaking Changes

- Upgrade to `v0.21.0` of `opentelemetry`
  For list of breaking changes in OpenTelemetry, see the
  [v0.21.0 changelog](https://github.com/open-telemetry/opentelemetry-rust/blob/v0.21.0/opentelemetry/CHANGELOG.md).
- Update MSRV to require Rust 1.65+, as `opentelemetry` requires it now. (#68)

### Fixed

- WASM Support (#57)
- Fix potential deadlock (#59)

Thanks to @jesseditson, @AsmPrgmC3, and @rthomas for contributing to this release!

# 0.21.0 (August 28, 2023)

### Added

- Ability to produce measurement with attributes (#43)

### Breaking Changes

- `MetricsLayer` is now generic over the its `Subscriber` impl to support
  [per-layer filtering] (#43)

### Fixed

- Trace IDs not matching when propagating invalid contexts (#55)

Thanks to @ymgyt and @hdost for contributing to this release!

[per-layer filtering]: https://docs.rs/tracing-subscriber/0.3.17/tracing_subscriber/layer/index.html#per-layer-filtering

# 0.20.0 (August 1, 2023)

### Added

- Add `OpenTelemetrySpanExt::set_attribute` function (#34)

### Breaking Changes

- Upgrade to `v0.20.0` of `opentelemetry` (#36)
  For list of breaking changes in OpenTelemetry, see the
  [v0.20.0 changelog](https://github.com/open-telemetry/opentelemetry-rust/blob/v0.20.0/opentelemetry-api/CHANGELOG.md#v0200).

Thanks to @ymgyt, @mladedav, @shaun-cox, and @Protryon for contributing to this release!

# 0.19.0 (May 23, 2023)

### Breaking Changes

- Upgrade to `v0.19.0` of `opentelemetry` (#12)
  For list of breaking changes in OpenTelemetry, see the
  [v0.19.0 changelog](https://github.com/open-telemetry/opentelemetry-rust/blob/main/opentelemetry/CHANGELOG.md#v0190).
- Update MSRV to require Rust 1.60+, as `opentelemetry` requires it now (#12)

Thanks to @jaysonsantos, @briankung, and @humb1t for contributing to this release!

# 0.18.0 (September 18, 2022)

### Breaking Changes

- Upgrade to `v0.18.0` of `opentelemetry` ([#2303])
  For list of breaking changes in OpenTelemetry, see the
  [v0.18.0 changelog](https://github.com/open-telemetry/opentelemetry-rust/blob/main/opentelemetry/CHANGELOG.md#v0180).

### Fixed

- `on_event` respects event's explicit parent ([#2296])

Thanks to @wprzytula for contributing to this release!

# 0.17.4 (July 1, 2022)

This release adds optional support for recording `std::error::Error`s using
[OpenTelemetry's semantic conventions for exceptions][exn-semconv].

### Added

- `Layer::with_exception_fields` to enable emitting `exception.message` and
  `exception.backtrace` semantic-convention fields when an `Error` is recorded
  as a span or event field ([#2135])
- `Layer::with_exception_field_propagation` to enable setting `exception.message` and
  `exception.backtrace` semantic-convention fields on the current span when an
  event with an `Error` field is recorded ([#2135])

Thanks to @lilymara-onesignal for contributing to this release!

[thread-semconv]: https://opentelemetry.io/docs/reference/specification/trace/semantic_conventions/exceptions/
[#2135]: https://github.com/tokio-rs/tracing/pull/2135

# 0.17.3 (June 7, 2022)

This release adds support for emitting thread names and IDs to OpenTelemetry, as
well as recording `std::error::Error` values in a structured manner with their
source chain included. Additionally, this release fixes issues related to event
and span source code locations.

### Added

- `Layer::with_threads` to enable recording thread names/IDs according to
  [OpenTelemetry semantic conventions][thread-semconv] ([#2134])
- `Error::source` chain when recording `std::error::Error` values ([#2122])
- `Layer::with_location` method (replaces `Layer::with_event_location`)
  ([#2124])

### Changed

- `std::error::Error` values are now recorded using `fmt::Display` rather than
  `fmt::Debug` ([#2122])

### Fixed

- Fixed event source code locations overwriting the parent span's source
  location ([#2099])
- Fixed `Layer::with_event_location` not controlling whether locations are
  emitted for spans as well as events ([#2124])

### Deprecated

- `Layer::with_event_location`: renamed to `Layer::with_location`, as it now
  controls both span and event locations ([#2124])

Thanks to new contributors @lilymara-onesignal, @hubertbudzynski, and @DevinCarr
for contributing to this release!

[thread-semconv]: https://opentelemetry.io/docs/reference/specification/trace/semantic_conventions/span-general/#source-code-attributes
[#2134]: https://github.com/tokio-rs/tracing/pull/2134
[#2122]: https://github.com/tokio-rs/tracing/pull/2122
[#2124]: https://github.com/tokio-rs/tracing/pull/2124
[#2099]: https://github.com/tokio-rs/tracing/pull/2099

# 0.17.2 (February 21, 2022)

This release fixes [an issue][#1944] introduced in v0.17.1 where
`tracing-opentelemetry` could not be compiled with `default-features = false`.

### Fixed

- Compilation failure with `tracing-log` feature disabled ([#1949])

[#1949]: https://github.com/tokio-rs/tracing/pull/1917
[#1944]: https://github.com/tokio-rs/tracing/issues/1944

# 0.17.1 (February 11, 2022) (YANKED)

### Added

- `OpenTelemetryLayer` can now add detailed location information to
  forwarded events (defaults to on) ([#1911])
- `OpenTelemetryLayer::with_event_location` to control whether source locations
  are recorded ([#1911])
### Changed

- Avoid unnecessary allocations to improve performance when recording events
  ([#1917])

Thanks to @djc for contributing to this release!

[#1917]: https://github.com/tokio-rs/tracing/pull/1917
[#1911]: https://github.com/tokio-rs/tracing/pull/1911

# 0.17.0 (February 3, 2022)

### Breaking Changes

- Upgrade to `v0.17.0` of `opentelemetry` (#1853)
  For list of breaking changes in OpenTelemetry, see the
  [v0.17.0 changelog](https://github.com/open-telemetry/opentelemetry-rust/blob/main/opentelemetry/CHANGELOG.md#v0170).

# 0.16.1 (October 23, 2021)

### Breaking Changes

- Upgrade to `v0.3.0` of `tracing-subscriber` ([#1677])
  For list of breaking changes in `tracing-subscriber`, see the
  [v0.3.0 changelog].

### Added

- `OpenTelemetrySpanExt::add_link` method for adding a link between a `tracing`
  span and a provided OpenTelemetry `Context` ([#1516])

Thanks to @LehMaxence for contributing to this release!

[v0.3.0 changelog]: https://github.com/tokio-rs/tracing/releases/tag/tracing-subscriber-0.3.0
[#1516]: https://github.com/tokio-rs/tracing/pull/1516
[#1677]: https://github.com/tokio-rs/tracing/pull/1677

# 0.15.0 (August 7, 2021)

### Breaking Changes

- Upgrade to `v0.17.1` of `opentelemetry` (#1497)
  For list of breaking changes in OpenTelemetry, see the
  [v0.17.1 changelog](https://github.com/open-telemetry/opentelemetry-rust/blob/main/opentelemetry/CHANGELOG.md#v0160).

# 0.14.0 (July 9, 2021)

### Breaking Changes

- Upgrade to `v0.15.0` of `opentelemetry` ([#1441])
  For list of breaking changes in OpenTelemetry, see the
  [v0.14.0 changelog](https://github.com/open-telemetry/opentelemetry-rust/blob/main/opentelemetry/CHANGELOG.md#v0140).

### Added

- Spans now include Opentelemetry `code.namespace`, `code.filepath`, and
  `code.lineno` attributes ([#1411])

### Changed

- Improve performance by pre-allocating attribute `Vec`s ([#1327])

Thanks to @Drevoed, @lilymara-onesignal, and @Folyd for contributing
to this release!

[#1441]: https://github.com/tokio-rs/tracing/pull/1441
[#1411]: https://github.com/tokio-rs/tracing/pull/1411
[#1327]: https://github.com/tokio-rs/tracing/pull/1327

# 0.13.0 (May 15, 2021)

### Breaking Changes

- Upgrade to `v0.14.0` of `opentelemetry` (#1394)
  For list of breaking changes in OpenTelemetry, see the
  [v0.14.0 changelog](https://github.com/open-telemetry/opentelemetry-rust/blob/main/opentelemetry/CHANGELOG.md#v0140).

# 0.12.0 (March 31, 2021)

### Breaking Changes

- Upgrade to `v0.13.0` of `opentelemetry` (#1322)
  For list of breaking changes in OpenTelemetry, see the
  [v0.13.0 changelog](https://github.com/open-telemetry/opentelemetry-rust/blob/main/opentelemetry/CHANGELOG.md#v0130).

### Changed

- Improve performance when tracked inactivity is disabled (#1315)

# 0.11.0 (January 25, 2021)

### Breaking Changes

- Upgrade to `v0.12.0` of `opentelemetry` (#1200)
  For list of breaking changes in OpenTelemetry, see the
  [v0.12.0 changelog](https://github.com/open-telemetry/opentelemetry-rust/blob/main/opentelemetry/CHANGELOG.md#v0120).

# 0.10.0 (December 30, 2020)

### Breaking Changes

- Upgrade to `v0.11.0` of `opentelemetry` (#1161)
  For list of breaking changes in OpenTelemetry, see the
  [v0.11.0 changelog](https://github.com/open-telemetry/opentelemetry-rust/blob/master/opentelemetry/CHANGELOG.md#v0110).
- Update `OpenTelemetrySpanExt::set_parent` to take a context by value as it is
  now stored and propagated. (#1161)
- Rename `PreSampledTracer::sampled_span_context` to
  `PreSampledTracer::sampled_context` as it now returns a full otel context. (#1161)

# 0.9.0 (November 13, 2020)

### Added

- Track busy/idle timings as attributes via `with_tracked_inactivity` (#1096)

### Breaking Changes

- Upgrade to `v0.10.0` of `opentelemetry` (#1049)
  For list of breaking changes in OpenTelemetry, see the
  [v0.10.0 changelog](https://github.com/open-telemetry/opentelemetry-rust/blob/master/opentelemetry/CHANGELOG.md#v0100).

# 0.8.0 (October 13, 2020)

### Added

- Implement additional record types (bool, i64, u64) (#1007)

### Breaking changes

- Add `PreSampledTracer` interface, removes need to specify sampler (#962)

### Fixed

- Connect external traces (#956)
- Assign default ids if missing (#1027)

# 0.7.0 (August 14, 2020)

### Breaking Changes

- Upgrade to `v0.8.0` of `opentelemetry` (#932)
  For list of breaking changes in OpenTelemetry, see the
  [v0.8.0 changelog](https://github.com/open-telemetry/opentelemetry-rust/blob/master/CHANGELOG.md#v080).

# 0.6.0 (August 4, 2020)

### Breaking Changes

- Upgrade to `v0.7.0` of `opentelemetry` (#867)
  For list of breaking changes in OpenTelemetry, see the
  [v0.7.0 changelog](https://github.com/open-telemetry/opentelemetry-rust/blob/master/CHANGELOG.md#v070).

# 0.5.0 (June 2, 2020)

### Added

- Support `tracing-log` special values (#735)
- Support `Span::follows_from` creating otel span links (#723)
- Dynamic otel span names via `otel.name` field (#732)

### Breaking Changes

- Upgrade to `v0.6.0` of `opentelemetry` (#745)

### Fixed

- Filter out invalid parent contexts when building span contexts (#743)

# 0.4.0 (May 12, 2020)

### Added

- `tracing_opentelemetry::layer()` method to construct a default layer.
- `OpenTelemetryLayer::with_sampler` method to configure the opentelemetry
  sampling behavior.
- `OpenTelemetryLayer::new` method to configure both the tracer and sampler.

### Breaking Changes

- `OpenTelemetrySpanExt::set_parent` now accepts a reference to an extracted
  parent `Context` instead of a `SpanContext` to match propagators.
- `OpenTelemetrySpanExt::context` now returns a `Context` instead of a
  `SpanContext` to match propagators.
- `OpenTelemetryLayer::with_tracer` now takes `&self` as a parameter
- Upgrade to `v0.5.0` of `opentelemetry`.

### Fixed

- Fixes bug where child spans were always marked as sampled

# 0.3.1 (April 19, 2020)

### Added

- Change span status code to unknown on error event

# 0.3.0 (April 5, 2020)

### Added

- Span extension for injecting and extracting `opentelemetry` span contexts
  into `tracing` spans

### Removed

- Disabled the `metrics` feature of the opentelemetry as it is unused.

# 0.2.0 (February 7, 2020)

### Changed

- Update `tracing-subscriber` to 0.2.0 stable
- Update to `opentelemetry` 0.2.0