# 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
