Release 2.16.0

• Add baggage to B3 codec (#319)

• Add support for 128bit trace ids to zipkin thrift spans. (#378)

• Update zipkin propagation logic to support 128bit traceIDs (#373)

• Accept "true" for the x-b3-sampled header (#356)

• Allow setting of PoolSpans from Config object (#322)

• Make propagators public to allow wrapping (#379)

• Change default metric namespace to use relevant separator for the metric backend (#364)

• Change metrics prefix to jaeger_tracer and add descriptions (#346)

• Bump OpenTracing to ^1.1.x (#383)

• Upgrade jaeger-lib to v2.0.0 (#359)

• Avoid defer when generating random number (#358)

• Use a pool of rand.Source to reduce lock contention when creating span ids (#357)

• Make JAEGER_ENDPOINT take priority over JAEGER_AGENT_XXX (#342)

Release 2.15.0

• Fix FollowsFrom spans ignoring baggage/debug header from dummy parent context (#313)
• Make maximum annotation length configurable in tracer options (#318)
• Support more environment variables in configuration (#323)
• Print error on Sampler Query failure (#328)
• Add an HTTPOption to support custom http.RoundTripper (#333)
• Return an error when an HTTP error code is seen in zipkin HTTP transport (#331)

Release 2.14.0

• Support throttling for debug traces (#274)
• Remove dependency on Apache Thrift (#303)
• Remove dependency on tchannel (#295) (#294)
• Test with Go 1.9 (#298)

Release 2.13

• Use value receiver for config.NewTracer() (#283)
• Lock span during jaeger thrift conversion (#273)
• Fix the RemotelyControlledSampler so that it terminates go-routine on Close() (#260)
• Added support for client configuration via env vars (#275) <Juraci Paixão Kröhling>
• Allow overriding sampler in the Config (#270)

Release 2.12.0

• Use lock when retrieving span.Context() (#268)
• Add Configuration support for custom Injector and Extractor (#263)

Release 2.11.2

Add Gopkg.toml to allow using the lib with dep

Release 2.11.1

• Do not enqueue spans after Reporter is closed (#235, #245)
• Change default flush interval to 1sec (#243)

Release 2.11.0

Normalize metric names and tags to be compatible with Prometheus (#222)

Release 2.10.0

• Allow customizing names of headers on the wire (#176)
• Add BaggageRestrictionManager (#178) and RemoteBaggageRestrictionManager (#182)
• Do not coerce baggage keys to lower case (#196)
• Log span name when span cannot be reported (#198)
• Add option to enable gen128Bit for tracer (#193) and allow custom generator for high bits of trace ID (#219)

Release 2.9.0

• Pin thrift <= 0.10 (#179)
• Introduce a parallel interface ContribObserver (#159)