# Changelog
## [v0.4.0](https://github.com/open-telemetry/opentelemetry-rust/compare/v0.3.0...v0.4.0)
### Added
- New async batch span processor
- New stdout exporter
- Add `trace_id` to `SpanBuilder`
### Changed
- Add `attributes` to `Event`s.
- Update `Span`'s `add_event` and `add_event_with_timestamp` to accept attributes.
- Record log fields in jaeger exporter
- Properly export span kind in jaeger exporter
- Add support for `Link`s
- Add `status_message` to `Span` and `SpanData`
- Rename `SpanStatus` to `StatusCode`
- Update `EvictedQueue` internals from LIFO to FIFO
- Switch span attributes to `EvictedHashMap`
### Fixed
- Call `shutdown` correctly when span processors and exporters are dropped
## [v0.3.0](https://github.com/open-telemetry/opentelemetry-rust/compare/v0.2.0...v0.3.0)
### Added
- New Base64 propagator
- New SpanBuilder api
- Zipkin Exporter crate
### Changed
- Switch to `SpanId` and `TraceId` from `u64` and `u128`
- Remove `&mut self` requirements for `Span` API
### Fixed
- circular Tracer debug impl
## [v0.2.0](https://github.com/open-telemetry/opentelemetry-rust/compare/b5918251cc07f9f6957434ccddc35306f68bd791..v0.2.0)
### Added
- Make trace and metrics features optional
- ExportResult as specified in the specification
- Add Futures compatibility API
- Added serde serialise support to SpanData
- Separate OpenTelemetry Jaeger crate
### Changed
- Rename HttpTraceContextPropagator to TraceContextPropagator
- Rename HttpB3Propagator to B3Propagator
- Switch to Apache 2 license
- Resolve agent addresses to allow non-static IP
- Remove tracer name prefix from span name
### Removed
- Remove add_link from spans
## [v0.1.5](https://github.com/jtescher/opentelemetry-rust/compare/v0.1.4...v0.1.5)
### Added
- trace-context propagator
### Changed
- Prometheus API cleanup
## [v0.1.4](https://github.com/jtescher/opentelemetry-rust/compare/v0.1.3...v0.1.4)
### Added
- Parent option for default sampler
### Fixed
- SDK tracer default span id
## [v0.1.3](https://github.com/jtescher/opentelemetry-rust/compare/v0.1.2...v0.1.3)
### Changed
- Ensure spans are always send and sync
- Allow static lifetimes for span names
- Improve KeyValue ergonomics
## [v0.1.2](https://github.com/jtescher/opentelemetry-rust/compare/v0.1.1...v0.1.2)
### Added
- Implement global provider
## [v0.1.1](https://github.com/jtescher/opentelemetry-rust/compare/v0.1.0...v0.1.1)
### Added
- Documentation and API cleanup
- Tracking of active spans via thread local span stack
## [v0.1.0](https://github.com/jtescher/opentelemetry-rust/commit/ea368ea965aa035f46728d75e1be3b096b6cd6ec)
Initial debug alpha