Version 0.13.0

KNOWN ISSUE:

This release is mostly unusable due to this issue with mis-configured pom files for the api and sdk:
#2345

We will be releasing version 0.13.1 as soon as we have a fix ready.

General

• Starting with 0.13.0, all unstable modules (the 2 metrics modules for now) will have a -alpha appended to their
  base version numbers to make it clear they are not production ready, and will not be when we get to releasing 1.0.
  See our Rationale document for details.

API

☢️ Breaking Changes

• The Labels.ArrayBackedLabelsBuilder class has been made non-public.
  You can still access the LabelsBuilder functionality via the Labels.builder() method.
• Methods deprecated in the 0.12.0 release have been removed or made non-public:
  • The HttpTraceContext class has been removed.
  • The toBuilder() method on the OpenTelemetry interface has been removed.
  • The Attributes.builder(Attributes) method has been removed in favor of Attributes.toBuilder(Attributes).
  • The DefaultContextPropagators class has made non-public.
  • The TraceMultiPropagator builder has been removed in favor of a simple factory method.
  • The value() method on the StatusCode enum has been removed.
  • The Baggage EntryMetadata class has been removed in favor of the BaggageEntryMetadata interface.
  • The setCallback() method on the asynchronous metric instruments has been removed.
• Several public classes have been made final.

📈 Enhancements

• An asMap method has been added to the Labels interface, to expose them as a java.util.Map.
• You can now enable strict Context verification via a system property (-Dio.opentelemetry.context.enableStrictContext=true)
  Enabling this mode will make sure that all Scopes that are created are closed, and generate log messages if they
  are not closed before being garbage collected. This mode of operation is CPU intensive, so be careful before
  enabling it in high-throughput environments that do not need this strict verification. See the javadoc on the
  io.opentelemetry.context.Context interface for details.
• Several of the methods on the Span interface have been given default implementations.
• The Semantic Attributes constants have been updated to the version in the yaml spec as of Dec 14, 2020.

🌟 Miscellaneous

• The Metrics API has been deprecated in the opentelemetry-api module, in preparation for releasing a fully-stable 1.0
  version of that module. The Metrics API will be removed from the module in the next release.
• The API has been broken into separate modules, in preparation for the 1.0 release of the tracing API.
  If you depend on the opentelemetry-api module, you should get the rest of the API modules as transitive dependencies.
• The OpenTelemetry.builder() and the OpenTelemetryBuilder interface have been deprecated and will be removed in the next release.
  The builder functionality is now only present on individual implementations of OpenTelemetry. For instance, the
  DefaultOpenTelemetry class has a builder available.
• The OpenTelemetry.setPropagators() has been deprecated and will be removed in the next release. You should instead create your
  OpenTelemetry implementations with the Propagators preset, via the various builder options. For example, use
  DefaultOpenTelemetry.builder().setPropagators(propagators).build() to configure your no-sdk implementation.

SDK

☢️ Breaking Changes

• Many SDK classes have been renamed to be prefixed with Sdk rather than having Sdk being embedded in the middle of the name.
  For example, TracerSdk has been renamed to SdkTracer and TracerSdkManagement has been renamed to SdkTracerManagement.
• The ResourcesConfig.builder() method has been made non-public.
• The TraceConfig.Builder class has been moved to the top-level TraceConfigBuilder class.
• The built-in exporter Builder classes have been moved to the top level, rather than inner classes. Access to the builders
  is still available via builder() methods on the exporter classes.
• The built-in SpanProcessor Builder classes have been moved to the top level, rather than inner classes. Access to the builders
  is still available via builder() methods on the SpanProcessor implementation classes.
• The built-in ParentBasedSampler Builder class has been moved to the top level, rather than inner classes. Access to the builder
  is still available via methods on the Sampler interface.
• The DaemonThreadFactory class has been moved to an internal module and should not be used outside of this repository.
• The builder class for the OpenTelemetrySdk class has been slimmed down. The configurable details have been moved into
  the specific provider builders, where they apply more specifically and obviously.
• Many public classes have been made final.
• The MetricExporter interface's shutdown() method now returns CompletableResultCode rather than void.
• The OpenTelemetrySdk's builder class has been moved to the top level, rather than being an inner class. It has been renamed to
  OpenTelemetrySdkBuilder as a part of that change.
• The OTLP exporters have been split into two separate modules, and the metrics exporter has been tagged with the -alpha version.
  If you continue to depend on the opentelemetry-exporters-otlp module, you will only get the trace exporter as a transitive dependency.

🌟 Miscellaneous

• The SpanData.Link.getContext() method has been deprecated in favor of a new SpanData.Link.getSpanContext().
  The deprecated method will be removed in the next release of the SDK.
• The internals of the (alpha) Metrics SDK have been significantly updated.
• OTLP adapter classes have been moved into the opentelemetry-sdk-extension-otproto module so they can be shared across OTLP usages.
• The zipkin exporter has been updated to have its error code handling match the spec.
• The logging exporter's format has changed to something slightly more human-readable.

Extensions

🐛 Bugfixes

• The opentelemetry-extension-annotations module now includes the api module as an api dependency, rather than just implementation.

☢️ Breaking Changes

• The deprecated opentelemetry-extension-runtime-metrics module has been removed. The functionality is available in the
  opentelemetry-java-instrumentation project under a different module name.
• The deprecated trace-utils module has been removed.
• Several public classes have been made final.

📈 Enhancements

• Some common OTLP adapter utilities have been moved into the opentelemetry-sdk-extension-otproto module so they can
  be shared across OTLP exporters.