Pre release v0.13.0

[Aneurysm9]

[0.13.0] - 2020-10-08

Added

• OTLP Metric exporter supports Histogram aggregation. (Enable exporting Histogram aggregation to OTLP metric #1209)
• The Code struct from the go.opentelemetry.io/otel/codes package now supports JSON marshaling and unmarshaling as well as implements the Stringer interface. (Update codes to match specification #1214)
• A Baggage API to implement the OpenTelemetry specification. (Add Baggage API and move Baggage propagator #1217)

Changed

• Set default propagator to no-op propagator. (Update the default propagator to be noop #1184)
• The HTTPSupplier, HTTPExtractor, HTTPInjector, and HTTPPropagator from the go.opentelemetry.io/otel/api/propagation package were replaced with unified TextMapCarrier and TextMapPropagator in the go.opentelemetry.io/otel package. (Update propagation to conform with OpenTelemetry specification #1212)
• The New function from the go.opentelemetry.io/otel/api/propagation package was replaced with NewCompositeTextMapPropagator in the go.opentelemetry.io/otel package. (Update propagation to conform with OpenTelemetry specification #1212)
• The status codes of the go.opentelemetry.io/otel/codes package have been updated to match the latest OpenTelemetry specification.
  They now are Unset, Error, and Ok.
  They no longer track the gRPC codes. (Update codes to match specification #1214)
• The StatusCode field of the SpanData struct in the go.opentelemetry.io/otel/sdk/export/trace package now uses the codes package from this package instead of the gRPC project. (Update codes to match specification #1214)
• Move the go.opentelemetry.io/otel/api/baggage package into go.opentelemetry.io/otel/propagators. (Add Baggage API and move Baggage propagator #1217)

Fixed

• Copies of data from arrays and slices passed to go.opentelemetry.io/otel/label.ArrayValue() are now used in the returned Value instead of using the mutable data itself. (Update label.ArrayValue to store copies of 1D arrays #1226)

Removed

• The ExtractHTTP and InjectHTTP functions from the go.opentelemetry.io/otel/api/propagation package were removed. (Update propagation to conform with OpenTelemetry specification #1212)
• The Propagators interface from the go.opentelemetry.io/otel/api/propagation package was removed to conform to the OpenTelemetry specification.
  The explicit TextMapPropagator type can be used in its place as this is the Propagator type the specification defines. (Update propagation to conform with OpenTelemetry specification #1212)
• The SetAttribute method of the Span from the go.opentelemetry.io/otel/api/trace package was removed given its redundancy with the SetAttributes method. (feat(span): remove SetAttribute method #1216)
• The internal implementation of Baggage storage is removed in favor of using the new Baggage API functionality. (Add Baggage API and move Baggage propagator #1217)
• Remove duplicate hostname key HostHostNameKey in Resource semantic conventions. (Remove duplicate hostname in Resource #1219)
• Nested array/slice support has been removed. (Update label.ArrayValue to store copies of 1D arrays #1226)

[codecov]

Codecov Report

Merging #1231 into master will not change coverage.
The diff coverage is 100.0%.

@@          Coverage Diff           @@
##           master   #1231   +/-   ##
======================================
  Coverage    76.6%   76.6%           
======================================
  Files         133     133           
  Lines        5754    5754           
======================================
  Hits         4412    4412           
  Misses       1093    1093           
  Partials      249     249           

Impacted Files	Coverage Δ
sdk/opentelemetry.go	100.0% <100.0%> (ø)

[MrAlias]

👍