# Changelog
## [v0.8.0](https://github.com/open-telemetry/opentelemetry-rust/compare/v0.7.0...v0.8.0)
## Added
- Add custom span processors to `Provider::Builder` #166
### Changed
- Separate `Carrier` into `Injector` and `Extractor` #164
- Change the default sampler to be `ParentOrElse(AlwaysOn)` #163
- Move the `Sampler` interface to the SDK #169
## [v0.7.0](https://github.com/open-telemetry/opentelemetry-rust/compare/v0.6.0...v0.7.0)
### Added
- New `ParentOrElse` sampler for fallback logic if parent is not sampled. #128
- Attributes can now have array values #146
- Added `record_exception` and `record_exception_with_stacktrace` methods to `Span` #152
### Changed
- Update sampler types #128
- `Always` is now `AlwaysOn`. `Never` is now `AlwaysOff`. `Probability` now ignores parent
sampled state.
- `base64` and `binary_propagator` have been moved to `experimental` module. #134
- `Correlation-Context` header has been updated to `otcorrelations` #145
- `B3Propagator` has been updated to more closely follow the spec #148
## [v0.6.0](https://github.com/open-telemetry/opentelemetry-rust/compare/v0.5.0...v0.6.0)
### Added
- Add `http` and `tonic` features to impl `Carrier` for common types.
### Changed
- Removed `span_id` from sampling parameters when implementing custom samplers.
### Fixed
- Make `Context` `Send + Sync` in #127
## [v0.5.0](https://github.com/open-telemetry/opentelemetry-rust/compare/v0.4.0...v0.5.0)
### Added
- Derive `Clone` for `B3Propagator`, `SamplingResult`, and `SpanBuilder`
- Ability to configure the span id / trace id generator
- impl `From<T>` for common `Key` and `Value` types
- Add global `tracer` method
- Add `Resource` API
- Add `Context` API
- Add `Correlations` API
- Add `HttpTextCompositePropagator` for composing `HttpTextPropagator`s
- Add `GlobalPropagator` for globally configuring a propagator
- Add `TraceContextExt` to provide methods for working with trace data in a context
- Expose `EvictedQueue` constructor
### Changed
- Ensure that impls of `Span` are `Send` and `Sync` when used in `global`
- Changed `Key` and `Value` method signatures to remove `Cow` references
- Tracer's `start` now uses the implicit current context instead of an explicit span context.
`start_with_context` may be used to specify a context if desired.
- `with_span` now accepts a span for naming consistency and managing the active state of a more
complex span (likely produced by a builder), and the previous functionality that accepts a
`&str` has been renamed to `in_span`, both of which now yield a context to the provided closure.
- Tracer's `get_active_span` now accepts a closure
- The `Instrument` trait has been renamed to `FutureExt` to avoid clashing with metric instruments,
and instead accepts contexts via `with_context`.
- Span's `get_context` method has been renamed to `span_context` to avoid ambiguity.
- `HttpTextPropagators` inject the current context instead of an explicit span context. The context
can be specified with `inject_context`.
- `SpanData`'s `context` has been renamed to `span_context`
### Fixed
- Update the probability sampler to match the spec
- Rename `Traceparent` header to `traceparent`
### Removed
- `TracerGenerics` methods have been folded in to the `Tracer` trait so it is longer needed
- Tracer's `mark_span_as_inactive` has been removed
- Exporters no longer require an `as_any` method
- Span's `mark_as_active`, `mark_as_inactive`, and `as_any` have been removed
## [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