Release v0.11.0

[Aneurysm9]

Added

• Noop and InMemory SpanBatcher implementations to help with testing integrations. (Add Noop and InMemory SpanBatcher, help with testing integrations #994)
• Integration tests for more OTel Collector Attribute types. (Integration tests for OTel Collector Attributes. #1062)
• A dimensionality-reducing metric Processor. (Add a dimensionality-reducing metric Processor #1057)
• Support for filtering metric label sets. (Add support for filtering metric label sets #1047)
• Support for exporting array-valued attributes via OTLP. (#869 - export array attributes to OTLP #992)

Changed

• Rename sdk/metric/processor/test to sdk/metric/processor/processortest (Rename test packages #1049)
• Rename sdk/metric/controller/test to sdk/metric/controller/controllertest (Rename test packages #1049)
• Rename api/testharness to api/apitest (Rename test packages #1049)
• Rename api/trace/testtrace to api/trace/tracetest (Rename test packages #1049)
• Change Metric Processor to merge multiple observations (Change Metric Processor to merge multiple observations #1024)
• The go.opentelemetry.io/otel/bridge/opentracing bridge package has been made into its own module.
  This removes the package dependencies of this bridge from the rest of the OpenTelemetry based project. (Make opentracing bridge into own Go module #1038)
• Renamed go.opentelemetry.io/otel/api/standard package to go.opentelemetry.io/otel/semconv to avoid the ambiguous and generic name standard and better describe the package as containing OpenTelemetry semantic conventions. (Rename api/standard package to semconv #1016)
• The environment variable used for resource detection has been changed from OTEL_RESOURCE_LABELS to OTEL_RESOURCE_ATTRIBUTES (Renaming OTEL_RESOURCE_LABELS env var #1042)
• Replace WithSyncer with WithBatcher in examples. (Replace WithSyncer with WithBatcher in examples #1044)
• Replace the google.golang.org/grpc/codes dependency in the API with an equivalent go.opentelemetry.io/otel/codes package. (Remove google.golang.org/grpc/codes dependency from API by adding an equivalent codes package #1046)
• Merge the go.opentelemetry.io/otel/api/label and go.opentelemetry.io/otel/api/kv into the new go.opentelemetry.io/otel/label package. (Unify api/label and api/kv in new label package #1060)
• Unify Callback Function Naming.
  Rename *Callback with *Func. (Rename Callback Function. #1061)
• CI builds validate against last two versions of Go, dropping 1.13 and adding 1.15. (Build on newly released version of go, go 1.15 #1064)

Removed

• Duplicate, unused API sampler interface. (Remove deadcode, and confusing sampler interface from API #999)
  Use the Sampler interface provided by the SDK instead.
• The grpctrace instrumentation was moved to the go.opentelemetry.io/contrib repository and out of this repository.
  This move includes moving the grpc example to the go.opentelemetry.io/contrib as well. (Move grpctrace to contrib repo #1027)
• The WithSpan method of the Tracer interface.
  The functionality this method provided was limited compared to what a user can provide themselves.
  It was removed with the understanding that if there is sufficient user need it can be added back based on actual user usage. (Remove WithSpan method from Tracer interface #1043)
• The RegisterSpanProcessor and UnregisterSpanProcessor functions.
  These were holdovers from an approach prior to the TracerProvider design. They were not used anymore. (Remove the orphaned RegisterSpanProcessor and UnregisterSpanProcessor #1077)
• The oterror package. (Remove the oterror package #1026)
• The othttp and httptrace instrumentations were moved to go.opentelemetry.io/contrib. (Remove othttp and httptrace instrumentations that have moved to contrib #1032)

Fixed

• The semconv.HTTPServerMetricAttributesFromHTTPRequest() function no longer generates the high-cardinality http.request.content.length label. (Move content length out of basic attributes #1031)
• Correct instrumentation version tag in Jaeger exporter. (Fix instrumentation lib version in spanDataToThrift #1037)
• The SDK span will now set an error event if the End method is called during a panic (i.e. it was deferred). (Remove WithSpan method from Tracer interface #1043)
• Move internally generated protobuf code from the go.opentelemetry.io/otel to the OTLP exporter to reduce dependency overhead. (Move OTLP to the OTLP exporter #1050)
• The otel-collector example referenced outdated collector processors. (update otel-collector example #1006)

[codecov]

Codecov Report

Merging #1089 into master will decrease coverage by 0.0%.
The diff coverage is 100.0%.

@@           Coverage Diff            @@
##           master   #1089     +/-   ##
========================================
- Coverage    76.9%   76.9%   -0.1%     
========================================
  Files         131     131             
  Lines        6969    6969             
========================================
- Hits         5366    5365      -1     
- Misses       1358    1360      +2     
+ Partials      245     244      -1     

Impacted Files	Coverage Δ
sdk/opentelemetry.go	100.0% <100.0%> (ø)
sdk/trace/batch_span_processor.go	80.4% <0.0%> (-1.1%)	⬇️