Added

• Dockerfile and docker-compose.yml to run example code. (#635)
• New grpctrace package that provides gRPC client and server interceptors for both unary and stream connections. (#621)
• New api/label package, providing common label set implementation. (#651)
• Support for JSON marshaling of Resources. (#654)
• TraceID and SpanID implementations for Stringer interface. (#642)
• RemoteAddrKey in the othttp plugin to include the HTTP client address in top-level spans. (#627)
• WithSpanFormatter option to the othttp plugin. (#617)
• Updated README to include section for compatible libraries and include reference to the contrib repository. (#612)
• The prometheus exporter now supports exporting histograms. (#601)
• A String method to the Resource to return a hashable identifier for a now unique resource. (#613)
• An Iter method to the Resource to return an array AttributeIterator. (#613)
• An Equal method to the Resource test the equivalence of resources. (#613)
• An iterable structure (AttributeIterator) for Resource attributes.

Changed

• zipkin export's NewExporter now requires a serviceName argument to ensure this needed values is provided. (#644)
• Pass Resources through the metrics export pipeline. (#659)

Removed

• WithKeys option from the metric API. (#639)

Fixed

• Use the label.Set.Equivalent value instead of an encoding in the batcher. (#658)
• Correct typo trace.Exporter to trace.SpanSyncer in comments. (#653)
• Use type names for return values in jaeger exporter. (#648)
• Increase the visibility of the api/key package by updating comments and fixing usages locally. (#650)
• Checkpoint only after Update; Keep records in the sync.Map longer. (#647)
• Do not cache reflect.ValueOf() in metric Labels. (#649)
• Batch metrics exported from the OTLP exporter based on Resource and labels. (#626)
• Add error wrapping to the prometheus exporter. (#631)
• Update the OTLP exporter batching of traces to use a unique string representation of an associated Resource as the batching key. (#623)
• Update OTLP SpanData transform to only include the ParentSpanID if one exists. (#614)
• Update Resource internal representation to uniquely and reliably identify resources. (#613)
• Check return value from CheckpointSet.ForEach in prometheus exporter. (#622)
• Ensure spans created by httptrace client tracer reflect operation structure. (#618)
• Create a new recorder rather than reuse when multiple observations in same epoch for asynchronous instruments. #610
• The default port the OTLP exporter uses to connect to the OpenTelemetry collector is updated to match the one the collector listens on by default. (#611)

Changes since v0.4.2

1de7f68 Prepare for releasing v0.4.3 (#664)
52b2534 (origin/master, origin/HEAD) Update Maintainer for Otel Go. (#660)
3008c1b Pass Resources through the metrics export pipeline (#659)
cd1be0e Use the label.Set.Equivalent value instead of an encoding in the batcher (#658)
6402598 add Dockerfile and docker-compose.yml to run example code (#635)
6de3dab Resolve #72 - gRPC Interceptor (#621)
0bb12d9 New api/label package, common label set impl (#651)
acb350b Support JSON marshal of Resources (#654)
d20fc72 Fix typo trace.Exporter to trace.SpanSyncer (#653)
ddad4d4 trace exporter: using type names for return values (#648)
927d915 Increase the visibility of the api/key package (#650)
395440d Checkpoint only after Update; Keep records in the sync.Map longer (#647)
e554562 Do not cache reflect.ValueOf() in metrics Labels (#649)
cf7c4e5 fix zipkin without local endpoint with service name (#644)
669d4b3 TraceID and SpanID implementations for Stringer Interface (#642)
ebc245b Batch Metrics Exported From the OTLP Exporter (#626)
a8f7b32 Remove WithKeys() option, defaultkeys batcher (#639)
bcb8b64 prometheus: add error wrapping (#631)
8c94927 othttp: add RemoteAddrKey for including HTTP client address in top-level spans (#627)
0a9e861 Update the OTLP exporter batching of traces (#623)
856aad9 Update OTLP SpanData transform (#614)
8e97011 Update Resource (#613)
6005d01 prometheus: check return value from CheckpointSet.ForEach (#622)
c8ec530 Ensure spans created by httptrace client tracer reflect operation structure (#618)
6489b07 othttp: add WithSpanFormatter option (#617)
367635b Create a new recorder rather than reuse one for same labels (#610)
0f771bb (tools) added readme section to point to contrib repo (#612)
446727b Updated default port for OTLP exporter (#611)
8ef02a6 prometheus: add histogram support to exporter (#601)