CHANGELOG.md

Changelog

Unreleased

Version 1.45.0 (2024-12-06)

API

• Add convenience method setAttribute(Attribute<Long>, int) to SpanBuilder (matching the existing convenience method in Span) (#6884)
• Extends TextMapGetter with experimental GetAll() method, implement usage in W3CBaggagePropagator (#6852)

SDK

Traces

• Add synchronization to SimpleSpanProcessor to ensure thread-safe export of spans (#6885)

Metrics

• Lazily initialize ReservoirCells (#6851)

Logs

• Add synchronization to SimpleLogRecordProcessor to ensure thread-safe export of logs (#6885)

Exporters

• OTLP: Update opentelementry-proto to 1.4 (#6906)
• OTLP: Rename internal Marshaler#writeJsonToGenerator method to allow jackson runtimeOnly dependency (#6896)
• OTLP: Fix repeated string serialization for JSON. (#6888)
• OTLP: Fix missing unsafe available check (#6920)

Extensions

• Declarative config: Don't require empty objects when referencing custom components (#6891)

Tooling

• Add javadoc boilerplate internal comment v2 for experimental classes (#6886)
• Update develocity configuration (#6903)

Version 1.44.1 (2024-11-10)

SDK

Traces

• Fix regression in event attributes (#6865)

Version 1.44.0 (2024-11-08)

API

• Fix ConfigUtil#getString ConcurrentModificationException (#6841)

SDK

Traces

• Stabilize ExceptionEventData (#6795)

Metrics

• Stabilize metric cardinality limits (#6794)
• Refactor metrics internals to remove MeterSharedState (#6845)

Exporters

• Add memory mode option to stdout exporters (#6774)
• Log a warning if OTLP endpoint port is likely incorrect given the protocol (#6813)
• Fix OTLP gRPC retry mechanism for unsuccessful HTTP responses (#6829)
• Add ByteBuffer field type marshaling support (#6686)
• Fix stdout exporter format by adding newline after each export (#6848)
• Enable reusuable_data memory mode by default for OtlpGrpc{Signal}Exporter, OtlpHttp{Signal}Exporter, OtlpStdout{Signal}Exporter, and PrometheusHttpServer (#6799)

Extension

• Rebrand file configuration to declarative configuration in documentation (#6812)
• Fix declarative config file_format validation (#6786)
• Fix declarative config env substitution by disallowing '}' in default value (#6793)
• Set declarative config default OTLP protocol to http/protobuf (#6800)
• Stabilize autoconfigure disabling of resource keys via otel.resource.disabled.keys (#6809)

Tooling

• Run tests on Java 23 (#6825)
• Test Windows in CI (#6824)
• Add error prone checks for internal javadoc and private constructors (#6844)

Version 1.43.0 (2024-10-11)

API

• Add helper class to capture context using ScheduledExecutorService (#6712)
• Adds Baggage.getEntry(String key) (#6765)

Extensions

• Fix ottracepropagation for short span ids (#6734)

SDK

Metrics

• Optimize advice with FilteredAttributes (#6633)

Exporters

• Add experimental stdout log, metric, trace exporters for printing records to stdout in standard OTLP JSON format. (#6675, #6750)
• Add Marshalers for profiling signal type (#6680)

Extensions

• Add *Model suffix to declarative config generated classes. (#6721)
• Use autoconfigured ClassLoader to load declarative config (#6725)
• Update declarative config to use opentelemetry-configuration v0.3.0 (#6733)
• Add StructuredConfigProperties#getStructured default method, add StructuredConfigProperties.empty() (#6759)

Testing

• Add context info about wrong span or trace. (#6703)

Version 1.42.1 (2024-09-10)

API

• Revert java-test-fixtures plugin to remove test dependencies from pom.xml. (#6695)

Version 1.42.0 (2024-09-06)

API

• BREAKING: Stabilize log support for AnyValue bodies. Rename AnyValue to Value, promote from opentelemetry-api-incubator to opentelemetry-api, change package from io.opentelemetry.api.incubator.logs to io.opentelemetry.api.common. (#6591)
• Noop implementations detect when opentelemetry-api-incubator is present and return extended noop implementations. (#6617)%

SDK

Traces

• Added experimental support for SpanProcessor OnEnding callback (#6367)
• Remove final modifier from SdkTracer.tracerEnabled (#6687)

Exporters

• Suppress zipkin exporter instrumentation (#6552)
• OTLP exporters return status code exceptions via CompletableResultCode in GrpcExporter and HttpExporter. (#6645)
• Align GrpcSender contract with HttpSender (#6658)

Extensions

• Add autoconfigure support for ns and us durations (#6654)
• Add declarative configuration ComponentProvider support for resources (#6625)
• Add declarative configuration ComponentProvider support for processors (#6623)
• Add declarative configuration ComponentProvider support for samplers (#6494)
• Add declarative configuration ComponentProvider support for propagators (#6624)
• Add declarative configuration missing pieces (#6677)
• Change jaeger remote sampler autoconfigure property from pollingInterval to pollingIntervalMs to match spec. (#6672)

Testing

• Add asserts for log record body fields (#6509)

Version 1.41.0 (2024-08-09)

API

• Move experimental suppress instrumentation context key to api internal package (#6546)

Incubator

• Fix bug in ExtendedContextPropagators preventing context extraction when case is incorrect. (#6569)

SDK

• Extend CompletableResultCode with failExceptionally(Throwable). (#6348)

Metrics

• Avoid allocations when experimental advice doesn't remove any attributes. (#6629)

Exporter

• Enable retry by default for OTLP exporters. (#6588)
• Retry ConnectException, add retry logging. (#6614)
• Extend PrometheusHttpServer with ability to configure default aggregation as function of instrument kind, including experimental env var support. (#6541)
• Add exporter data model impl for profiling signal type. (#6498)
• Add Marshalers for profiling signal type. (#6565)
• Use generateCertificates() of CertificateFactory to process certificates. (#6579)

Extensions

• Add file configuration ComponentProvider support for exporters. (#6493)
• Remove nullable from file config Factory contract. (#6612)

Version 1.40.0 (2024-07-05)

API

Incubator

• Narrow ExtendedSpanBuilder return types for chaining (#6514)
• Add APIs to determine if tracer, logger, instruments are enabled (#6502)

SDK

Extensions

• Move autoconfigure docs to opentelemetry.io (#6491)

Version 1.39.0 (2024-06-07)

API

Incubator

• BREAKING: Refactor ExtendedTracer, ExtendedSpanBuilder to reflect incubating API conventions (#6497)

SDK

Exporter

• BREAKING: Serve prometheus metrics only on /metrics by default. To restore the previous behavior and serve metrics on all paths, override the default handler as demonstrated here. (#6476)
• Make OTLP exporter memory mode API public (#6469)
• Speed up OTLP string marshaling using sun.misc.Unsafe (#6433)
• Add exporter data classes for experimental profiling signal type. (#6374)
• Start prometheus http server with daemon thread (#6472)
• Update the Prometheus metrics library and improve how units are included in metric names. (#6473)
• Remove android animalsniffer check from prometheus exporter (#6478)

Extensions

• Load file config YAML using core schema, ensure that env var substitution retains string types. (#6436)
• Define dedicated file configuration SPI ComponentProvider (#6457)

Tooling

• Normalize timestamps and file ordering in jars, making the outputs reproducible (#6471)
• GHA for generating the post-release pull request (#6449)

Version 1.38.0 (2024-05-10)

API

• Stabilize synchronous gauge (#6419)

Incubator

• Add put(AttributeKey, T) overload to EventBuilder (#6331)

Baggage

• Baggage filters space-only keys (#6431)

SDK

• Add experimental scope config to enable / disable scopes (i.e. meter, logger, tracer) (#6375)

Traces

• Add ReadableSpan#getAttributes (#6382)
• Use standard ArrayList size rather than max number of links for initial span links allocation (#6252)

Metrics

• Use low precision Clock#now when computing timestamp for exemplars (#6417)
• Update invalid instrument name log message now that forward slash / is valid (#6343)

Exporters

• Introduce low allocation OTLP marshalers. If using autoconfigure, opt in via OTEL_JAVA_EXPERIMENTAL_EXPORTER_MEMORY_MODE=REUSABLE_DATA.
  • Low allocation OTLP logs marshaler (#6429)
  • Low allocation OTLP metrics marshaler (#6422)
  • Low allocation OTLP trace marshaler (#6410)
  • Add memory mode support to OTLP exporters (#6430)
  • Marshal span status description without allocation (#6423)
  • Add private constructors for stateless marshalers (#6434)
• Mark opentelemetry-exporter-sender-jdk stable (#6357)
• PrometheusHttpServer prevent concurrent reads when reusable memory mode (#6371)
• Ignore TLS components (SSLContext, TrustManager, KeyManager) if plain HTTP protocol is used for exporting (#6329)
• Add is_remote_parent span flags to OTLP exported Spans and SpanLinks (#6388)
• Add missing fields to OTLP metric exporters toString() (#6402)

Extensions

• Rename otel.config.file to otel.experimental.config.file for autoconfigure (#6396)

OpenCensus Shim

• Fix opencensus shim spanBuilderWithRemoteParent behavior (#6415)

Tooling

• Add additional API incubator docs (#6356)
• Run build on java 21 (#6370)
• Fix running tests with java 8 on macos (#6411)
• Move away from deprecated gradle enterprise APIs (#6363)

Version 1.37.0 (2024-04-05)

NOTICE: This release contains a significant restructuring of the experimental event API and the API incubator artifact. Please read the notes in the API -> Incubator section carefully.

API

• Promote Span#addLink to stable API (#6317)

Incubator

• BREAKING: Rename opentelemetry-extension-incubator to opentelemetry-api-incubator, merge opentelemetry-api-events into opentelemetry-api-incubator. (#6289)
• BREAKING: Remove domain from event api. EventEmitterProvider#setEventDomain has been removed. The event.name field should now be namespaced to avoid collisions. See Semantic Conventions for Event Attributes for more details. (#6253)
• BREAKING: Rename EventEmitter and related classes to EventLogger. (#6316)
• BREAKING: Refactor Event API to reflect spec changes. Restructure API to put fields in the AnyValue log record body. Add setters for timestamp, context, and severity. Set default severity to INFO=9. (#6318)

SDK

• Add get{Signal}Exporter methods to Simple{Signal}Processor, Batch{Signal}Processor. (#6078)

Metrics

• Use synchronized instead of reentrant lock in explicit bucket histogram (#6309)

Exporters

• Fix typo in OTLP javadoc (#6311)
• Add PrometheusHttpServer#toBuilder() (#6333)
• Bugfix: Use getPrometheusName for Otel2PrometheusConverter map keys to avoid metric name conflicts (#6308)

Extensions

• Add Metric exporter REUSABLE_DATA memory mode configuration options, including autoconfigure support via env var OTEL_JAVA_EXPERIMENTAL_EXPORTER_MEMORY_MODE=REUSABLE_DATA. (#6304)
• Add autoconfigure console alias for logging exporter (#6027)
• Update jaeger autoconfigure docs to point to OTLP (#6307)
• Add ServiceInstanceIdResourceProvider implementation for generating service.instance.id UUID if not already provided by user. Included in opentelemetry-sdk-extension-incubator. (#6226)
• Add GCP resource detector to list of resource providers in autoconfigure docs (#6336)

Tooling

• Check for Java 17 toolchain and fail if not found (#6303)

Version 1.36.0 (2024-03-08)

SDK

Traces

• Lazily initialize the container for events in the SDK Span implementation (#6244)

Exporters

• Add basic proxy configuration to OtlpHttp{Signal}Exporters (#6270)
• Add connectTimeout configuration option OtlpGrpc{Signal}Exporters (#6079)

Extensions

• Add ComponentLoader to autoconfigure support more scenarios (#6217)
• Added MetricReader customizer for AutoConfiguredOpenTelemetrySdkBuilder (#6231)
• Return AutoConfiguredOpenTelemetrySdkBuilder instead of the base type (#6248)

Tooling

• Add note about draft PRs to CONTRIBUTING.md (#6247)

Version 1.35.0 (2024-02-09)

NOTE: The opentelemetry-exporter-jaeger and opentelemetry-exporter-jaeger-thift artifacts have stopped being published. Jaeger has native support for OTLP, and users should export to jaeger using OTLP instead.

API

Incubator

• Add Span#addLink, for adding a link after span start (#6084)

SDK

Traces

• Bugfix: Ensure span status cannot be updated after set to StatusCode.OK (#6209

Metrics

• Reusable memory Mode: Adding support for exponential histogram aggregation (#6058, #6136)
• Reusable memory mode: Adding support for explicit histogram aggregation (#6153)
• Reusable memory mode: Adding support for sum aggregation (#6182)
• Reusable memory mode: Adding support for last value aggregation (#6196)

Exporters

• Recreate / fix graal issue detecting RetryPolicy class (#6139, #6134)
• Restore prometheus metric name mapper tests, fix regressions (#6138)
• WARNING: Remove jaeger exporters (#6119)
• Update dependency io.zipkin.reporter2:zipkin-reporter-bom to 3.2.1. Note: ZipkinSpanExporterBuilder#setEncoder(zipkin2.codec.BytesEncoder) has been deprecated in favor of ZipkinSpanExporterBuilder#setEncoder(zipkin2.reporter.BytesEncoder). ZipkinSpanExporterBuilder#setSender(zipkin2.reporter.Sender) has been deprecated in favor of ZipkinSpanExporterBuilder#setSender(zipkin2.reporter.BytesMessageSender). (#6129, #6151)
• Include trace flags in otlp marshaller (#6167)
• Add Compressor SPI support to OtlpGrpc{Signal}Exporters (#6103)
• Allow Prometheus exporter to add resource attributes to metric attributes (#6179)

Extension

• Autoconfigure accepts encoded header values for OTLP exporters (#6164)
• Return implementation type from AutoConfiguredOpenTelemetrySdkBuilder.addLogRecordProcessorCustomizer (#6248)

Incubator

• Align file configuration with latest changes to spec (#6088)

Tooling

• Stop including old artifacts in bom (#6157)
• Define CODECOV token (#6186)

Version 1.34.1 (2024-01-11)

• Fix prometheus exporter regressions (#6138)
• Fix native image regression (#6134)

Version 1.34.0 (2024-01-05)

NOTE: This is the LAST release for opentelemetry-exporter-jaeger and opentelemetry-exporter-jaeger-thift. Jaeger has native support for OTLP, and users should export to jaeger using OTLP instead.

API

• Ability to access version.properties API file with GraalVM native (#6095)

SDK

Traces

• Only call SpanProcessor onStart / onEnd if required (#6112)
• Add option to export unsampled spans from span processors (#6057)

Metrics

• Memory Mode: Adding first part support for synchronous instruments - storage (#5998)
• Base2ExponentialHistogramAggregation maxBuckets must be >= 2 (#6093)
• Convert histogram measurements to double before passing recording exemplar reservoir (#6024)

Exporters

• Add compressor SPI to support additional compression algos (#5990)
• Test OTLP exporters with different OkHttp versions (#6045)
• Refactor prometheus exporter to use io.prometheus:prometheus-metrics-exporter-httpserver, add exponential Histogram support (#6015)
• UpstreamGrpcSenderProvider uses minimal fallback managed channel when none is specified (#6110)
• OTLP exporters propagate serialization IOException instead of rethrowing as runtime (#6082)

Extensions

• Autoconfigure reads normalized otel.config.file property (#6105)

Version 1.33.0 (2023-12-08)

API

• Fix issue where wrapping "invalid" SpanContexts in Span does not preserve SpanContext (#6044)

Incubator

• Refactor and add to ExtendedTracer, add ExtendedContextPropagators (#6017)
• Base64 encode AnyValue bytes in string representation (#6003)

SDK

Exporters

• Add connectTimeout configuration option OtlpHttp{Signal}Exporters (#5941)
• Add ability for Otlp{Protocol}LogRecordExporter to serialize log body any value (#5938)
• Android environments can now handle base64 encoded PEM keys, remove exception handling in TlsUtil#decodePem (#6034)
• Add header supplier configuration option to OTLP exporters (#6004)

Extensions

• Add autoconfigure option for customizing SpanProcessor, LogRecordProcessor (#5986)
• Incubator allows for simpler creation of start-only and end-only SpanProcessors. (#5923)

Testing

• Add hasAttributesSatisfying overload to AbstractPointAssert (#6048)

Project Tooling

• Building animal sniffer signatures directly from android corelib (#5973)
• Target kotlin 1.6 in kotlin extension (#5910)
• Define language version compatibility requirements (#5983)

Version 1.32.0 (2023-11-13)

API

• Stabilize explicit bucket boundaries advice API (#5897)
• Allow events to be emitted with timestamp (#5928)

Context

• Add null check to StrictContextStorage (#5954)

Incubator

• Experimental support for Log AnyValue body (#5880)

SDK

Metrics

• Dismantle AbstractInstrumentBuilder inheritance hierarchy (#5820)
• Fix delta metric storage concurrency bug that allows for lost writes when record operations occur during collection. The fix introduces additional work on record threads to ensure correctness. The additional overhead is non-blocking and should be small according to performance testing. Still, there may be an opportunity for further optimization. (#5932, #5976)

Exporters

• Prometheus exporter: omit empty otel_scope_info and otel_target_info metrics (#5887)
• JdkHttpSender should retry on connect exceptions (#5867)
• Expand the set of retryable exceptions in JdkHttpSender (#5942)
• Identify OTLP export calls with context key used for instrumentation suppression (#5918)

Testing

• Add log support to junit extensions (#5966)

SDK Extensions

• Add file configuration to autoconfigure (#5831)
• Update to file configuration to use opentelemetry-configuration v0.1.0 (#5899)
• Add env var substitution support to file configuration (#5914)
• Stop setting Resource schemaUrl in autoconfigure (#5911)
• Add AutoConfigureListener to provide components with autoconfigured SDK (#5931)

OpenCensus Shim

• Clean up OpenCensus shim (#5858)

OpenTracing Shim

• Fix OpenTracing header name issue (#5840)

Version 1.31.0 (2023-10-06)

API

Incubator

• Refactor advice API to simplify usage (#5848)

SDK

• BatchLogRecordProcessor and BatchSpanProcessor unify queueSize metric description and attribute name for processorType (#5836)

Metrics

• Allow instrument names to contain a forward slash (#5824)
• Memory Mode support: Adding memory mode, and implementing it for Asynchronous Instruments (#5709, #5855)
• Stabilize MetricProducer, allow custom MetricReaders (#5835)
• Drop NaN measurements to metric instruments (#5859)
• Fix flaky MetricExporterConfigurationTest (#5877)

Logs

• Add addAllAttributes() to ReadWriteLogRecord. (#5825)

Exporters

• Prometheus exporter: handle colliding metric attribute keys (#5717)

SDK Extensions

• File configuration ConfigurationReader handles null values as empty (#5829)

Semantic conventions

• BREAKING: Stop publishing io.opentelemetry:opentelemetry-semconv. Please use io.opentelemetry.semconv:opentelemetry-semconv:1.21.0-alpha instead, which is published from open-telemetry/semantic-conventions-java. The new repository is published in lockstep with open-telemetry/semantic-conventions. (#5807)

Project Tooling

• Add Benchmark workflows (#5842, #5874)
• Add clearer docs around coroutine support with an example (#5799)

Version 1.30.1 (2023-09-11)

• Fix autoconfigure bug creating multiple PrometheusHttpServer instances with same port (#5811)

Version 1.30.0 (2023-09-08)

API

Incubator

• Add experimental synchronous gauge (#5506)

SDK

Metrics

• Add attributes advice API (#5677, #5722)
• Add AttributesProcessor toString, add attribute filter helper (#5765)
• Increase metric name maximum length from 63 to 255 characters (#5697)

Exporter

• Prometheus exporter: remove non-ucum units from conversion (#5719)
• Prometheus exporter: add units to metric names in TYPE and HELP comments (#5718)

SDK Extensions

• Add support for file based configuration to incubator (#5687, #5751, #5758, #5757, #5755, #5763, #5766, #5773, #5771, #5779)
• Autoconfigure ConfigProperties#getMap filters entries with blank values instead of throwing (#5784)

Semantic conventions

• DEPRECATION: io.opentelemetry:opentelemetry-semconv is deprecated for removal. Please use io.opentelemetry.semconv:opentelemetry-semconv:1.21.0-alpha instead, which is published from open-telemetry/semantic-conventions-java. The new repository is published in lockstep with open-telemetry/semantic-conventions. (#5786)

Project Tooling

• Update Gradle Wrapper from 8.2.1 to 8.3 (#5728)
• Remove dependabot and update-gradle-wrapper task in favor of renovate (#5746)

Version 1.29.0 (2023-08-11)

API

• Update Span javadoc to allow null/empty attr values (#5616)

SDK

• Add Sdk{Signal}ProviderBuilder#addResource(Resource) method to merge Resource with current (#5619)

Metrics

• Add LongHistogramAdviceConfigurer to improve api surface types (#5689)
• Instruments with names which are case-insensitive equal contribute to same metric, advice is not part of instrument identity. (#5701)

Exporter

• Add OtlpHttp{Signal}Exporter#toBuilder() methods (#5652)
• Add OtlpGrpc{Signal}Exporter#toBuilder() methods (#5680)
• Add #toString to OTLP exporters (#5686)
• Break out GrpcSender, GrpcSenderProvider (#5617)

SDK Extensions

• BREAKING: Delete zpages (#5611)
• Initialize file configuration with generated model classes and parse method (#5399)
• Refactor SpiUtil to improve mocking (#5679)
• Switch from snakeyaml to snakeyaml engine (#5691)
• Add experimental autoconfigure support for customizing cardinality limit (#5659)
• Reorganize autoconfigure docs by signal (#5665)

Testing

• Add hasResourceSatisfying to LogRecordDataAssert (#5690)

OpenCensus Shim

• Change OpenCensus shim default sampling to defer to OpenTelemetry (#5604)

Project Tooling

• Update Gradle Wrapper from 8.2 to 8.2.1 (#5618)
• Fix gradle java version requirement warning (#5624)
• Refer to Adoptium/Temurin instead of AdoptOpenJDK (#5636)
• Use OtelVersionClassPlugin instead of reading version from resource (#5622)
• Enforce build-graal success in required status check (#5696)

Version 1.28.0 (2023-07-07)

opentelemetry-sdk-extension-autoconfigure is now stable! See "SDK Extension" notes below for changes made prior to stabilization.

SDK

Metrics

• Make Advice proper immutable class (#5532)
• Show attributes when async instruments record duplicate measurements (#5542)
• After cardinality limit exceeded record measurements to overflow series (#5560)

Exporter

• Add HttpSender abstraction with OkHttp implementation (#5505)
• Add HttpSenderProvider SPI (#5533)
• Add JDK 11+ HttpClient HttpSender implementation (#5557)
• Remove unnecessary :exporter:otlp:common dependencies (#5535)
• Fix OTLP exporter artifact name in an error message (#5541)
• Stabilize RetryPolicy API for OTLP exporters (#5524)
• DEPRECATION: opentelemetry-exporter-jaeger and opentelemetry-exporter-jaeger-thrift are now deprecated with the last release planned for 1.34.0 (January 2024) (#5190)

SDK Extensions

• Mark opentelemetry-sdk-extension-autoconfigure as stable (#5577)
• Refactor autoconfigure registerShutdownHook(boolean) to disableShutdownHook() (#5565)
• AutoConfiguredOpenTelemetrySdkBuilder does not set GlobalOpenTelemetry by default (#5564)
• Add public API to autoconfigure to access environment resource (#5554)
• Move autoconfigure getConfig to internal, remove getResource (#5467)
• Add autoconfigure support for low memory metric temporality setting (#5558)
• DEPRECATION: zpages extension from opentelemetry-sdk-extension-incubator is now deprecated (#5578)

Project tooling

• Publish build scans to ge.opentelemetry.io (#5510)
• Update Gradle Wrapper from 8.0.1 to 8.1.1 (#5531)
• Add action to auto update gradle wrapper (#5511)

Version 1.27.0 (2023-06-09)

The log bridge API / SDK are now stable! Some important notes:

• The contents of opentelemetry-api-logs have been merged into opentelemetry-api.
• The contents of opentelemetry-exporter-otlp-logs have been merged into opentelemetry-exporter-otlp.
• The contents of opentelemetry-sdk-logs-testing have been merged into opentelemetry-sdk-testing.
• The opentelemetry-sdk-logs artifact has been marked stable.
• opentelemetry-sdk-extension-autoconfigure has changed the default value of otel.logs.exporter from none to otlp.

NOTE: reminder that the Logs Bridge API is not meant for end users. Log appenders use the API to bridge logs from existing log frameworks (e.g. JUL, Log4j, SLf4J, Logback) into OpenTelemetry. Users configure the Log SDK to dictate how logs are processed and exported. See opentelemetry.io for documentation on usage.

API

• Promote log API to stable (#5341)
• fix doc for OpenTelemetry class (#5454)

SDK

• Ensure correct compiled output and sources are included in multi version jar (#5487)

Logs

• Fix broken link (#5451)
• Add meaningful .toString to NoopLogRecordProcessor and DefaultOpenTelemetry (#5493)
• Promote log SDK to stable (#5341)

Metrics

• Reset exponential aggregator scale after collection (#5496)
• Experimental metric reader and view cardinality limits (#5494)

Exporter

• Merge otlp logs (#5432)
• Append unit to prometheus metric names (#5400)

Testing

• Merge sdk logs testing (#5431)
• Add a hasBucketBoundaries() variant that allows specifying precision (#5457)

SDK Extensions

• Enable otlp logs by default in autoconfigure (#5433)

Semantic Conventions

• Update to semconv 1.20.0 (#5497)

Version 1.26.0 (2023-05-05)

This release represents the release candidate ("RC") release for the Logs Bridge API / SDK. In the next release (1.27.0), opentelemetry-api-logs will be merged into opentelemetry-api, opentelemetry-sdk-logs will be marked as stable, opentelemetry-exporter-otlp-logs will be merged into opentelemetry-exporter-otlp, opentelemetry-sdk-logs-testing will be merged into opentelemetry-sdk-testing, opentelemetry-sdk-extension-autoconfigure will enable otlp log exporter by default (i.e. otel.logs.exporter=otlp). For more details, see tracking issue #5340. NOTE: reminder that the Logs Bridge API is not meant for end users. Log appenders use the API to bridge logs from existing log frameworks (e.g. JUL, Log4j, SLf4J, Logback) into OpenTelemetry. Users configure the Log SDK to dictate how logs are processed and exported.

opentelemetry-opentracing-shim is now stable!

SDK

• Create OtelVersion class at build time which is used to resolve artifact version in Resource. (#5365)

Metrics

• Add prototype histogram advice API (i.e. Hints). (#5217)

Logs

• Add LogRecord observed timestamp field. (#5370)
• Remove log record timestamp default. (#5374)
• Align BatchLogRecordProcessor defaults with specification. (#5364)
• Rename setEpoch to setTimestamp. (#5368)
• Log SDK cleanup. Move InMemoryLogRecordExporter to opentelemetry-sdk-logs-testing. Rename InMemoryLogRecordExporter#getFinishedLogItems to getFinishedLogRecordItems. Move SdkEventEmitterProvder to internal package. (#5368)

Exporters

• Add scaffolding for low level exporter TLS API. (#5362)
• Add new low level TLS APIs on OTLP and Jaeger gRPC exporter builders. (#5280, #5422)
• OTLP LogRecord exporters serialize observed timestamp. (#5382)
• Update prometheus test to reflect new collector behavior. (#5417)
• Prometheus exporter checks metrics name to prevent add duplicated _total suffix. (#5308)
• Add additional OTLP test for authenticator. (#5391)

OpenTracing Shim

• Mark opentracing-shim as stable. (#5371)

SDK Extensions

• Fixes jaeger remote sampler service strategies bug resolving service name. (#5418)
• Fix flaky JaegerRemoteSamplerGrpcNettyTest. (#5385)
• Add new log level TLS APIs on JaegerRemoteSamplerBuilder. (#5422)
• Fix a parameter name typo in autoconfigure-spi module. (#5409)

Semantic Conventinos

• Add missing links to deprecated constants in SemanticAttributes. (#5406)

Project Tooling

• Update stale workflow. (#5381)
• Skip OWASP dependencyCheck on test modules. (#5383)
• Skip OWASP dependencyCheck on jmh tasks. (#5384)
• Drop create website pull request release step (#5361)

Version 1.25.0 (2023-04-07)

API

• Cache ImmutableKeyValuePairs#hashCode (#5307)

Propagators

• Remove streams from B3Propagator (#5326)

SDK

Metrics

• Stop validating instrument unit (#5279)
• Make the Executor for PrometheusHttpServer configurable (#5296)

Exporter

• Fix marshaler self suppression error (#5318)
• Add sdk dependency to Logging OTLP exporter (#5291)

Testing

• Fixing up javadoc to reflect how to create a junit4 OpenTelemetryRule (#5299)

SDK Extensions

• BREAKING: Autoconfigure drops support for otel.exporter.otlp.metrics.default.histogram.aggregation=EXPONENTIAL_BUCKET_HISTOGRAM. Use BASE2_EXPONENTIAL_BUCKET_HISTOGRAM instead. (#5290)
• JaegerRemoteSampler use upstream grpc implementation if ManagedChannel is set (#5287)

OpenTracing Shim

• Adds version to otel tracer instrumentation scope (#5336)

OpenCensus Shim

• Adds version to otel tracer instrumentation scope (#5336)

Semantic Conventions

• Update semconv to 1.19.0 and related build tool changes (#5311)

Version 1.24.0 (2023-03-10)

SDK

Metrics

• Optimize DefaultSynchronousMetricStorage iteration to reduce allocations (#5183)
• Avoid exemplar allocations if there are no measurements (#5182)
• Remove boxed primitives from aggregations to reduce allocations (#5184)
• Stop ignoring long measurements in HistogramExemplarReservoir (#5216)
• Remove validations for noop instrument names and units (#5146)
• Allow views to select on instrument unit (#5255)

Exporter

• Add (internal) TlsConfigHelper for additional TLS configurability (#5246)

SDK Extensions

• Introduce mTLS support for JaegerRemoteSamplerBuilder (#5209) (#5248)

OpenTracing Shim

• OpenTracing Shim: Update Tracer.close() (#5151)

• Update version to 1.24.0 (#5198)

• Post release 1.23.0 (#5202)

OpenCensus Shim

• Addresses opencensus-shim trace issues under otel javaagent (#4900)

Project tooling

• Cleanup readmes (#5263)
• Upgrade to gradle 8.0.1 (#5256)
• Fixed example resource provider classname. (#5235)
• Fix case of bug label in open issue workflow (#5268)

Semantic Conventions

• Update semconv to 1.19.0 (#5311)

Version 1.23.1 (2023-02-15)

• Fix bug that broke AutoConfiguredOpenTelemetrySdk's shutdown hook. (#5221)

Version 1.23.0 (2023-02-10)

This release is a notable release for metrics:

• The base2 exponential histogram aggregation has been marked as stable. To use, configure your MetricExporter with a default aggregation of Aggregation.base2ExponentialBucketHistogram() for histogram instruments. If using OTLP exporter with autoconfigure, set OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION=BASE2_EXPONENTIAL_BUCKET_HISTOGRAM. If using configuring OTLP programatically, use Otlp*MetricExporterBuilder#setDefaultAggregationSelector(DefaultAggregationSelector).
• The metrics SDK undergone significant internal refactoring which results in reduced complexity and significantly reduced memory allocation during metric collection / export.

API

Logs

• WARNING: Split out Event API from Log API. Event API is now published in opentelemetry-api-events. API / SDK usage has also changed - see PR for details. (#5049)

SDK

• Add shutdown / close to OpenTelemetrySdk (#5100)

Metrics

• Base2 exponential histogram aggregations are now stable. Add base2ExponentialBucketHistogram() to Aggregation. (#5143)
• Promote exponential histogram data interfaces to stable package (#5120)
• Add Base2 prefix to internal exponential histogram classes (#5179)
• Add MaxScale config parameter to Base2ExponentialBucketHistogram (#5044)
• Add close method to MetricReader (#5109)
• Reuse AggregatorHandle with cumulative temporality to reduce allocations (#5142)
• Delete notion of accumulation to reduce allocations (#5154)
• Delete bound instruments (#5157)
• Reuse aggregation handles for delta temporality to reduce allocations (#5176)

Exporter

• Add proper shutdown implementations for all exporters (#5113)

SDK Extensions

• WARNING: Remove deprecated autoconfigure exemplar filter names. Previous names none, all , with_sampled_trace have been removed. Use always_off, always_on, trace_based instead. (#5098)
• Add autoconfigure support for "none" option for propagator value (#5121)
• Add autoconfigure support for parentbased_jaeger_remote sampler (#5123)
• Autoconfigure closes up autoconfigured resources in case of exception (#5117)
• View file based config has switched from snakeyaml to snakeyaml-engine for YAML parsing. (#5138)
• Fix autoconfigure resource providers property docs (#5135)

Testing

• WARNING: Merge opentelemetry-sdk-metrics-testing into opentelemetry-sdk-testing. Stop publishing opentelemetry-sdk-metrics-testing. (#5144)
• Sort spans by start time (parents before children as tiebreaker) to avoid common causes for flaky tests (#5026)
• Add resource assertion methods to SpanDataAssert and MetricAssert (#5160)

Semantic Conventions

• Update semconv to 1.18.0 (#5188) (#5134)

OpenTracing Shim

• Refactor to remove internal objects BaseShimObject and TelemetryInfo (#5087)
• WARNING: Minimize public surface area of OpenTracingShim. Remove createTracerShim() , createTracerShim(Tracer), createTracerShim(Tracer, OpenTracingPropagators). Add createTracerShim(TracerProvder,TextMapPropagator,TextMapPropagator). (#5110)

Project tooling

• Add OWASP dependency check (#5177)

Version 1.22.0 (2023-01-06)

API

• WARNING: GlobalOpenTelemetry trigger of autoconfiguration is now opt-in. Previously, GlobalOpenTelemetry.get triggered autoconfiguration if opentelemetry-sdk-extension-autoconfigure was detected on the classpath. That behavior is now opt-in by setting environment variable OTEL_JAVA_GLOBAL_AUTOCONFIGURE_ENABLED=true. (#5010)
• Update LoggerBuilder, MeterBuilder, TracerBuilder javadoc (#5050)

Context

• Make closing scope idempotent and non-operational when corresponding context is not current. (#5061)

SDK

• Standardize internal usage of ConfigUtil for reading environment variables and system properties (#5048)

Metrics

• Lazily initialize exponential histogram buckets (#5023)
• Delete MapCounter alternative exponential histogram implementation (#5047)
• Add toString to SdkMeter, SdkObservableInstrument, AbstractInstrumentBuilder (#5072)

Exporter

• OtlpGrpcSpanExporter, OtlpHttpSpanExporter, OtlpGrpcLogRecordExporter, OtlpHttpLogRecordExporter, ZipkinSpanExporter, and JaegerGrpcSpanExporter are now instrumented with GlobalOpenTelemetry by default. Instrumentation initializes lazily to prevent ordering issue of accessing GlobalOpenTelemetry.get before GlobalOpenTelemetry.set is called. (#4993)
• Add ConfigurableSpanExporterProvider implementation for JaegerGrpcSpanExporter (#5002)
• Add ConfigurableSpanExporterProvider, ConfigurableMetricExporterProvider, ConfigurableLogRecordExporterProvider for OtlpGrpc{Signal}Exporters and OtlpHttp{SignalExporters (#5003)
• Replace OTLP User-Agent spaces with dashes (#5080)
• Add AutoConfigurationCustomizerProvider implementation for PrometheusHttpServer (#5053)
• Add resource target_info and scope target_info metrics to PrometheusHttpServer in compliance with spec (#5039)
• Drop delta metrics in PrometheusHttpServer (#5062)
• PrometheusHttpServer drops metrics with same name and different type (#5078)

SDK Extensions

• DEPRECATION: Align autoconfigure exemplar filter names with spec. Previous names none, all, with_sampled_trace are deprecated. Use always_off, always_on, trace_based instead. (#5063)

OpenTracing Shim

• Add createTracerShim function (#4988)

Version 1.21.0 (2022-12-09)

API

API Extensions

• WARNING: opentelemetry-extension-aws has been removed following its relocation to opentelemetry-java-contrib/aws-xray-propagator, which is published under coordinates io.opentelemetry.contrib:opentelemetry-aws-xray-propagator:{version}. We will push security patches to 1.20.x as needed. The latest opentelemetry-bom will point to the latest published version, currently 1.20.1. (#4945)
• Add toString implementation to various propagator components (#4996)

SDK

Logs

• Add toString implementation to various log SDK components (#4979)

Metrics

• Add histogram collection benchmark (#4912)
• Add ExponentialHistogramIndexerBenchmark (#4989)
• Stop extra copy of exponential histogram buckets (#5020)

Exporter

• Zipkin exporter serializes EventData attributes as JSON (#4934)
• Add support for EC mTLS keys (applies to OtlpHttp{Signal}Exporter, OtlpGrpc{Signal}Exporter, JaegerGrpcSpanExporter, JaegerRemoteSampler) (#4920)
• Add Configurable{Signal}ExporterProvider implementations for Logging{Signal}Exporters (#4950)
• Add ConfigurableSpanExporterProvider implementation for ZipkinSpanExporter (#4991)
• Add Configurable{Signal}ExporterProvider implementations for OtlpJsonLogging{Signal}Exporters (#4992)
• ZipkinSpanExporter populates remoteEndpoint (#4933)

SDK Extensions

• BREAKING: Remove support for otel.experimental.sdk.enabled from autoconfigure (#4973)
• De-singleton ZPageServer implementation (#4935)
• Add auto-configure support for logging-otlp exporters (#4879)
• Move DefaultConfigProperties to internal package in opentelemetry-sdk-extension-autoconfigure-spi (#5001)

Testing

• Make APIs for asserting attributes consistent (#4882)
• Attribute assertions error messages always contain the attr key (#5027)

Semantic Conventions

• Update semantic and resource attributes for spec v1.16.0 (#4938, #5033)

OpenTracing Shim

• Handle unsupported types when setting Attributes (#4939)
• Properly set the status based on the error tag (#4962)
• Handle io.opentracing.noop.NoopSpan correctly (#4968)
• Log invalid arguments rather than throwing exceptions. (#5012)
• Stop mapping semconv values from OpenTracing to OTel. (#5016)

Version 1.20.1 (2022-11-15)

Bugfixes

• Fix bug in ComponentRegistry that produces ConcurrentModificationException when reading metrics at the same time as obtaining a meter. (#4951)

Version 1.20.0 (2022-11-11)

API

• Fix bug in W3CBaggagePropagator that caused + characters to be decoded as whitespace . (#4898)

API Extensions

• DEPRECATION: the opentelemetry-extension-aws module containing various AwsXrayPropagator implementations has been deprecated for removal in next minor version. A copy of the code will instead be maintained in opentelemetry-java-contrib/aws-xray-propagator and published under coordinates io.opentelemetry.contrib:opentelemetry-aws-xray-propagator:{version}. (#4862)

SDK

Traces

• Add graal hints for shaded dependencies, allowing JcTools queue to be used in graal environment. (#4832)
• Sampler#getDescription() implementations are now locale independent. (#4877)
• Allow SDK to run in environments prohibiting use of sun.misc.Unsafe. (#4902)

Metrics

• Add toString to AbstractInstrument. (#4833)
• Add zero bucket boundary to default explicit bucket histogram aggregation. (#4819)

Logs

• Optimize log hot path, reducing allocations significantly. (#4913)
• BREAKING: Add Context argument to LogRecordProcessor#onEmit. (#4889)

Exporter

• OtlpLogging{Signal}Exporters encode enums as numbers. (#4783)
• Add User-Agent header of OTel OTLP Exporter Java/{version} to OTLP export requests. (#4784)

SDK Extensions

• WARNING: opentelemetry-sdk-extension-aws has been removed following its relocation to opentelemetry-java-contrib/instrumentation-aws-xray, which is published under coordinates io.opentelemetry.contrib:opentelemetry-aws-resources:{version}. We will push security patches to 1.19.x as needed. The latest opentelemetry-bom will point to the latest published version, currently 1.19.0. (#4830)
• WARNING: opentelemetry-sdk-extension-resources has been removed following its relocation to opentelemetry-java-instrumentation/instrumentation/resources/library, which is published under coordinates io.opentelemetry.instrumentation:opentelemetry-resources:{version}. We will push security patches to 1.19.x as needed. The latest opentelemetry-bom will point to the latest published version, currently 1.19.0. (#4828)
• Add autoconfigure support for BatchLogRecordProcessor. (#4811)
• Autoconfigure performs percent decoding on otel.resource.attributes values. (#4653)
• Unify compression configuration for exporters including (#4775):
  • Fix handling of none in OTLP exporters.
  • Add JaegerGrpcSpanExporterBuilder#setCompression(String).
  • Add ZipkinSpanExporterBuilder#setCompression(String).

Semantic Conventions

• Add migration notes to deprecated attributes (#4840)

OpenTracing Shim

• Use opentracing-shim as instrumentation scope name. (#4890)
• Add full support for multiple parents. (#4916)

Version 1.19.0 (2022-10-07)

This release contains a large number of changes to the log signal following a series of significant changes to the log specification. The changes include renaming key classes like LogExporter to LogRecordExporter, and LogProcessor to LogRecordProcessor, and LogEmitter to Logger, and more. Additionally, a log API component has been added for emitting events and for writing log appenders. Note, the log API is not a substitute for traditional log frameworks like Log4j, JUL, SLF4J, or Logback. While the event portion of the API is intended for instrumentation authors and end users, the API for emitting LogRecords is not. See LoggerProvider and Logger javadoc for more details.

General

• Add opentelemetry-bom as a dependency to opentelemetry-bom-alpha, ensuring synchronization between alpha and stable artifact versions.

API

API Extensions

• WARNING: opentelemetry-extension-annotations has been removed following its relocation to opentelemetry-java-instrumentation/instrumentation-annotations, which is published under coordinates io.opentelemetry.instrumentation:opentelemetry-instrumentation-annotations:{version}. We will push security patches to 1.18.x as needed. The latest opentelemetry-bom will point to the latest published version, currently 1.18.0.

Logs

• Introduce log API for emitting events and writing log appenders. The artifact is available at coordinates io.opentelemetry:opentelemetry-api-logs:1.19.0-alpha.

SDK

Metrics

• Change exponential histogram bucket boundaries to be lower exclusive / upper inclusive, instead of lower inclusive / upper exclusive.

Logs

• BREAKING: Rename SdkLogEmitterProvider to SdkLoggerProvider. OpenTelemetrySdkBuilder#setLogEmitterProvider has changed to OpenTelemetrySdkBuilder#setLoggerProvider. OpenTelemetrySdk#getSdkLogEmitterProvider has changed to OpenTelemetrySdk#getSdkLoggerProvider. AutoConfigurationCustomizer#addLogEmitterProviderCustomizer has changed to AutoConfigurationCustomizer#addLoggerProviderCustomizer.
• BREAKING: Rename LogEmitter to Logger.
• BREAKING: Rename LogExporter to LogRecordExporter. SystemOutLogExporter has changed to SystemOutLogRecordExporter. OtlpJsonLoggingLogExporter has changed to OtlpJsonLoggingLogRecordExporter. OtlpHttpLogExporter has changed to OtlpHttpLogRecordExporter. OtlpGrpcLogExporter has changed to OtlpGrpcLogRecordExporter. InMemoryLogExporter has changed to InMemoryLogRecordExporter. ConfigurableLogExporterProviderhas changed toConfigurableLogRecordExporterProvider`.
• BREAKING: Rename LogData to LogRecordData. TestLogData has changed to TestLogRecordData.
• BREAKING: Rename LogProcessor to LogRecordProcessor. BatchLogProcessor has changed to BatchLogRecordProcessor. SimpleLogProcessor has changed to SimpleLogRecordProcessor.

Exporter

• OTLP log record exporters now include dropped_attributes_count.

SDK Extensions

• Autoconfigure now supports an option to disable the SDK. If otel.sdk.disabled=true, AutoConfiguredOpenTelemetrySdk#getOpenTelemetrySdk() returns a minimal (but not noop) OpenTelemetrySdk with noop tracing, metric and logging providers. The same minimal instance is set to GlobalOpenTelemetry. The now deprecated property otel.experimental.sdk.enabled will continue to work in the same way during a transition period.
• Fix ProcessResource directory separator to use / or \ instead of : or ;.
• DEPRECATION: the opentelemetry-sdk-extension-resource module containing various ResourceProvider implementations has been deprecated for removal in next major version. A copy of the code will instead be maintained in opentelemetry-java-instrumentation/instrumentation/resources/library and published under coordinates io.opentelemetry.instrumentation:opentelemetry-resources:{version}.
• DEPRECATION: the opentelemetry-sdk-extension-aws module containing AWS ResourceProvider implementations has been deprecated for removal in next major version. A copy of the code will instead be maintained in opentelemetry-java-contrib/aws-resources and published under coordinates io.opentelemetry.contrib:opentelemetry-aws-resources:{version}.

OpenTracing Shim

• Fully support Baggage-only propagation.

Semantic conventions

• The semantic conventions have been updated to 1.13.0.

Version 1.18.0 (2022-09-09)

SDK

• Added scope attributes to InstrumentationScopeInfo accessible via InstrumentationScopeInfo#getAttributes(). Will add the ability to specify scope attributes in Meter, Tracer, and Logger in a future version.
• DEPRECATION: The InstrumentationScopeInfo#create(String, String, String) method has been deprecated in favor of InstrumentationScopeInfo#builer(String).setVersion(String).setSchemaUrl(String).build().
• Optimize Resource#merge(Resource) by returning early if the other resource is empty.

Logs

• Fix module name of opentelemetry-sdk-logs by changing from io.opentelemetry.sdk.extension.logging to io.opentelemetry.sdk.logs.

Testing

• Add methods to assert attributes do not contain keys via AttributeAssert#doesNotContainKey().

Exporter

• Added ability to specify local IP address in ZipkinSpanExporter via ZipkinSpanExporterBuilder#setLocalIpAddressSupplier(Supplier<InetAddress>).
• Upgrade to OTLP protobuf version 0.19.0.
• OTLP exporters now serialize InstrumentationScopeInfo#getAttributes().
• Stop publishing opentelemetry-exporter-jaeger-proto. The opentelemetry-bom will include a constraint on the last published version 1.17.0. If security issues are discovered, patches will be published to 1.17.x.

SDK Extensions

• BREAKING: opentelemetry-sdk-extension-metric-incubator, opentelemetry-sdk-extension-tracing-incubator, and opentelemetry-sdk-extension-zpages merged into opentelemetry-sdk-extension-incubator.
• BREAKING: Move opentelemetry-sdk-extension-jfr-events to opentelemetry-java-contrib/jfr-events. It will now be published under the coordinates io.opentelemetry.contrib:opentelemetry-jfr-events:{version}.
• BREAKING: Move opentelemetry-extension-noop-api to opentelemetry-java-contrib/noop-api. It will now be published under the coordinates io.opentelemetry.contrib:opentelemetry-noop-api:{version}.
• Improve ECS resource detection to include aws.ecs.container.arn, container.image.name, container.image.tag, aws.ecs.container.image.id, aws.log.group.arns, aws.log.group.names, aws.log.steam.names, aws.ecs.task.arn, aws.ecs.task.family, and aws.ecs.task.revision.
• Fix resource container.id detection when using k8s with containerd v1.5.0+.
• Add experimental ConditionalResourceProvider SPI, for conditionally applying resource providers based on current config and resource.

Micrometer shim

• BREAKING: Move opentelemetry-micrometer1-shim to opentelemetry-java-instrumentation/instrumentation/micrometer/micrometer-1.5/library. It will now be published under the coordinates io.opentelemetry.instrumentation:opentelemetry-micrometer-1.5:{version}.

Version 1.17.0 (2022-08-12)

API

API Extensions

• DEPRECATION: the opentelemetry-extension-annotations module containing @WithSpan and @SpanAttribute annotations has been deprecated for removal in next major version. A copy of the code will instead be maintained in opentelemetry-java-instrumentation/instrumentation-annotations and published under coordinates io.opentelemetry.instrumentation:opentelemetry-instrumentation-annotations:{version}.

SDK

Traces

• Add default implementation for SpanData#getInstrumentationScopeInfo() and ReadableSpan#getInstrumentationScopeInfo(). This fixes a previous mistake where those interfaces were extended without default implementation, a breaking change for source compatibility. Stricter checks have been added to ensure this mistake is not repeated.

Logs

• BREAKING: delete LogDataBuilder. A similar implementation of LogData called TestLogData has been added to opentelemetry-sdk-logs-testing.
• BREAKING: rename LogProcessor#emit(LogData) to LogProcessor#onEmit(ReadWriteLogRecord). The argument change from LogData to ReadWriteLogRecord allows implementations to mutate logs. To obtain LogData, call ReadWriteLogRecord#toLogData().
• Optimize SdkLogEmitterProvider to return noop LogEmitter when no LogProcessors are registered.

Exporter

• Split out shared and internal exporter classes from opentelemetry-exporter-otlp-common to opentelemetry-exporter-common.
• Add experimental support for OTLP header based authentication. To use, add a dependency on opentelemetry-exporter-common and call io.opentelemetry.exporter.internal.auth.Authenticator#setAuthenticatorOnDelegate(OtlpHttp{Signal}Builder, Authenticator).
• Add ability to collect export metrics on ZipkinSpanExporter via ZipkinSpanExporter#setMeterProvider(MeterProvider).
• Minor optimization to OkHttp based exporters to cache endpoint URLs. Applies to OtlpHttp{Signal}Exporter, OtlpGrpc{Signal}Exporter, and more.
• Fix diagnostic log message in OtlpGrpc{Signal}Exporter to include correct environment variables.

SDK Extensions

• Extend View file based configuration with support for specifying explicit bucket histogram bucket boundaries and exponential bucket counts.
• Extend autoconfigure SPI AutoConfigurationCustomizerProvider and ResourceProvider with option to specify ordering.
• Add autoconfigure SPI with ConfigurableLogExporterProvider, allowing custom named log exporters to be provided and selected via autoconfigure.
• Extend autoconfigure SPI with AutoConfigurationCustomizer#addPropertiesCustomizer, providing the ability examine current configuration properties and add / overwrite properties.

Version 1.16.0 (2022-07-13)

API

• Fix bug ImmutableKeyValuePairs implementation that causes ArrayIndexOutOfBoundsException to be thrown under certain conditions.

SDK

Traces

• Optimize BatchSpanProcessor using JcTools.

Metrics

• Tighten up exponential histogram implementation for alignment with specification: Default to 160 positive and negative buckets. Remove ability to configure starting scale. Minimum number of buckets is one instead of zero.
• Allow MetricExporter and MetricReader to influence default aggregation. The default aggregation is used when no registered views match an instrument.

Exporter

• Fix handling of client keys in PEM format.
• For OTLP exporters, change behavior to use OkHttpGrpcExporter (OkHttp implementation that doesn't use any gRPC dependencies) unless OtlpGrpc{Signal}Builder#setChannel(ManagedChannel) is called by user. Previously, OkHttpGrpcExporter was used if no gRPC implementation was found on classpath.
• Add support to configure default aggregation on OTLP metric exporters via Otlp{Protocol}MetricExporterBuilder#setDefaultAggregationSelector(DefaultAggregationSelector).

Testing

• Add span status assertions.

SDK Extensions

• Autoconfigure properly handles non-string system properties.
• Autoconfigure normalizes hyphens - to periods . when accessing ConfigProperties.

OpenTracing Shim

• Add support for span wrappers.
• Store OpenTracing SpanContext in OpenTracing Span wrapper.
• Use Baggage of active span.

Version 1.15.0 (2022-06-10)

API

• Add batch callback API, allowing a single callback to record measurements to multiple metric instruments.

SDK

Metrics

• SdkMeterProvider#toString() now returns a useful string describing configuration.
• Fix bug preventing proper function of Metrics SDK when multiple readers are present (#4436).
• Fix reporting intervals for metrics for delta readers (#4400).

Exporter

• BREAKING: merge all stable OTLP exporters into opentelemetry-exporter-otlp. opentelemetry-exporter-otlp-trace, opentelemetry-exporter-otlp-metrics, opentelemetry-exporter-otlp-http-trace, and opentelemetry-exporter-otlp-http-metrics are no longer published and their contents have been merged into a single artifact.
• BREAKING: merge log OTLP exporters into opentelemetry-exporter-otlp-logs. opentelemetry-exporter-otlp-http-logs is no longer published and its contents have been merged into a single artifact.
• Upgrade to OTLP protobuf version 0.18.0.
• RetryInterceptor retries on SocketTimeoutException with no message.
• Added JaegerGrpcSpanExporterBuilder#setMeterProvider(), enabling support of experimental jaeger span export metrics.
• DEPRECATION: the opentelemetry-exporter-jaeger-proto module containing jaeger proto definitions and corresponding generated classes is deprecated for removal in next major version.
• OTLP gRPC exporters support overriding :authority via OtlpGrpc*ExporterBuilder#addHeader("host", "my-authority-override").

SDK Extensions

• BREAKING: Move ConfigureableMetricExporterProvider from opentelemetry-sdk-extension-autoconfigure to stable opentelemetry-sdk-extension-autoconfigure-spi.
• Autoconfigure now supports multiple values for otel.metrics.exporter.
• Autoconfigure now supports general attribute limits, applicable to span attributes, span event attributes, span link attributes, and log attributes.
• Autoconfigure now supports an experimental option to disable the SDK. If otel.experimental.sdk.enabled=true, AutoConfiguredOpenTelemetrySdk#getOpenTelemetrySdk() returns a minimal (but not noop) OpenTelemetrySdk. The same minimal instance is set to GlobalOpenTelemetry.
• New "get or default" methods have been added to ConfigProperties. E.g. ConfigProperties#getString("otel.metrics.exporter", "otlp") fetches the value for the property otel.metrics.exporter and returns otlp if it is not set.
• Fix bug in ContainerResource provider that caused it to throw an exception in some instances when containerd is used.

Micrometer shim

• Cache descriptions such that metrics with the same name use the first seen description.

Version 1.14.0 (2022-05-09)

The metrics SDK is stable! New stable artifacts include:

• io.opentelemetry:opentelemetry-sdk-metrics (also now included in io.opentelemetry:opentelemetry-sdk)
• io.opentelemetry:opentelemetry-exporter-otlp-metrics (also now included in io.opentelemetry:opentelemetry-exporter-otlp)
• io.opentelemetry:opentelemetry-exporter-otlp-http-metrics
• Metrics testing components have been moved from io.opentelemetry:opentelemetry-sdk-metrics-testing to the stable io.opentelemetry:opentelemetry-sdk-testing.

While the API of the metrics SDK is now stable, there are a couple of known issues that will be addressed in the next release:

• The start time is incorrect for delta metrics when the first recording for a set of attributes occurs after the first collections (#4400).
• Registering multiple readers results in incorrect metrics (#4436).

SDK

Traces

• Fix bug where non-runtime exception breaks BatchSpanProcessor.
• Fix bug preventing attribute limits from applying to exception events.

Logs

• BREAKING: Drop deprecated methods referencing InstrumentationLibraryInfo from Log SDK.

Metrics

• Instrument name is validated. If invalid, a warning is logged and a noop instrument is returned.
• Default unit is empty instead of 1. If an invalid unit is set, a warning is logged and empty is used.
• Ensure symmetry between type of PointData and their type of exemplars (double or long).
• BREAKING: Rename MetricReader#flush() to MetricReader#forceFlush().
• Introduce AggregationTemporalitySelector interface for selecting aggregation temporality based on instrument. MetricReader and MetricExporter extend AggregationTemporalitySelector.

SDK Extensions

• BREAKING: Remove deprecated option to specify temporality with otel.exporter.otlp.metrics.temporality. Use otel.exporter.otlp.metrics.temporality.preference instead.
• Log warning when AwsXrayPropagator can't identify parent span id.
• Fix jaeger remote sampling bug preventing correct parsing of 0-probability sampling strategies.

Exporter

• Fix prometheus exporter formatting bug when there are no attributes.
• Ensure prometheus metrics with the same name are serialized as a group.
• BREAKING: OtlpHttpMetricExporterBuilder and OtlpGrpcMetricExporterBuilder configure aggregation temporality via #setAggregationTemporalitySelector(AggregationTemporalitySelector).

Testing

• BREAKING: Metrics testing components added to stable io.opentelemetry:opentelemetry-sdk-testing module, including InMemoryMetricReader, InMemoryMetricExporter, and MetricAssertions.assertThat(MetricData) has been moved to OpenTelemetryAssertions.assertThat(MetricData).
• BREAKING: The patterns for metrics assertions have been adjusted to better align with assertj conventions. See #4444 for examples demonstrating the change in assertion patterns.
• BREAKING: Metric assertion class names have been simplified.
• Add TraceAssert.hasSpansSatisfyingExactlyInAnyOrder(..) methods.

Micrometer shim

• Instrumentation scope name changed to io.opentelemetry.micrometer1shim.

Project tooling

• Many improvements to the build and release workflows. Big thanks to @trask for driving standardization across opentelemetry-java, opentelemetry-java-instrumentation, and opentelemetry-java-contrib!

Version 1.13.0 (2022-04-08)

Although we originally intended 1.13.0 to be the first stable release of the metrics SDK, we've postponed it out of caution due to a large number of changes in both the metrics SDK specification and the java implementation. This release should be considered a release candidate for the metrics SDK. There are several notable changes mentioned in the Metrics section. Additionally, please note that the Auto-configuration module now enables metric export by default via OTLP, i.e. by default otel.metrics.exporter is set to otlp instead of none.

API

• Fix TraceStateBuilder reuse bug.

SDK

• InstrumentationScopeInfo replaces InstrumentationLibraryInfo. Methods returning InstrumentationLibraryInfo are deprecated.
• Add ResourceBuilder#removeIf(Predicate) method for symmetry with AttributesBuilder.

Traces

• Span events that record exceptions are instances of ExceptionEventData.

Metrics

• BREAKING: Remove MetricReader factory pattern:
  • MetricReader instances, rather than MetricReaderFacotry, are registered with SdkMeterProviderBuilder. For example: SdkMeterProvider.builder().registerMetricReader(PeriodicMetricReader.builder(exporter).build()).
  • MetricReader does not support custom implementations. Built-in readers include: PeriodicMetricReader, PrometheusHttpServer, and for testing, InMemoryMetricReader.
• BREAKING: Several breaking changes metrics to the Data classes:
  • MetriaData returns InstrumentationScopeInfo instead of InstrumentationLibraryInfo.
  • MetricData factories classes have been moved internal.
  • Exemplar data classes have been migrated to interfaces, and deprecated methods have been removed.
  • PointData classes have been migrated to interfaces.
  • ValueAtPercentile has been converted to ValueAtQuantile to reflect specification.
  • Drop HistogramPointData utility methods for finding bucket bounds.
• BREAKING: Move InstrumentType and InstrumentValueType to io.opentelemetry.sdk.metrics package.
• BREAKING: Several breaking changes to the InstrumentSelector / View APIs:
  • InstrumentSelector / View and corresponding builders have been moved to io.opentelemetry.sdk.metrics package.
  • InstrumentSelector meter selection criteria has been inlined and MeterSelector has been removed.
  • InstrumentSelector criteria has been reduced to reflect specification. All fields are exact match, except instrument name which accepts wildcard * and ? matches.
  • If InstrumentSelectorBuilder#build() is called without any selection criteria, an exception will be thrown.
  • View baggage appending attribute processor has been removed. Available for experimental use via SdkMeterProviderUtil#appendFilteredBaggageAttributes.
  • Concept of AttributeProcessor has been moved internal.
  • If a View configures an aggregation that is not compatible with the instrument type of a selected instrument, a warning is logged and the View is ignored.
• BREAKING: Remove deprecated Aggregation#histogram(). Use Aggregation#explicitBucketHistogram() instead.
• Relax behavior around conflicting instruments. If you register two instruments with the same name but conflicting description, unit, type, or value type, both will be exported and a warning will be logged indicating the metric identity conflict. Previously, the second registered would have produced a noop instrument. Likewise, if two views are registered that produce instruments with conflicting names, or if an instrument conflicts with a registered view's name, both will be exported and a warning will be logged indicating the view conflict.
• BREAKING: Exemplars have been moved to internal. By default, exemplars are enabled with with_sampled_trace filter. This can be adjusted via experimental APIs via SdkMeterProviderUtil#setExemplarFilter.
• BREAKING: MetricExporter#getPreferredTemporality() has been removed and replaced with getAggregationTemporality(InstrumentType), which allows exporters to dictate the aggregation temporality on a per-instrument basis. MetricExporter#alwaysCumulative(InstrumentType) and MetricExporter#deltaPreferred(Instrument) are provided as utilities representing common configurations.
• Callbacks associated with asynchronous instruments with multiple matching views will only be called once per collection, instead of once per view per collection.
• PeriodicMetricReader will no longer call MetricExporter#export if no metrics are available.
• BREAKING: SdkMeterProviderBuilder#setMinimumCollectionInterval has been removed. Available for experimental use via SdkMeterProviderUtil#setMinimumCollectionInterval.
• Introduce lock ensuring that metric collections occur sequentially.
• Add min and max to HistogramDataPoint.

Logs

• BREAKING: Deprecated name field has been removed.

Exporter

• Upgrade to OTLP protobuf version 0.16.0.
• Jaeger and Zipkin exporters export otel.scope.name and otel.scope.version, in addition to otel.library.name and otel.library.version which are retained for backwards compatibility.
• BREAKING: Remove deprecated PrometheusCollector. Use PrometheusHttpServer instead.
• Add support for mTLS authentication to OTLP and jaeger exporters.
• Only log once if OTLP gRPC export receives UNIMPLEMENTED.
• Jaeger remote sampler sets appropriate sampling strategy type if not provided in response.
• BREAKING: The setPreferredTemporality method has been removed from OtlpGrpcMetricExporterBuilder and OtlpHttpMetricExporterBuilder. Use setAggregationTemporality(Function<InstrumentType, AggregationTemporality>) instead.

SDK Extensions

• IMPORTANT: Auto-configuration sets otel.metrics.exporter to otlp instead of none, enabling metric export by default.
• Auto-configuration added otel.java.enabled.resource-providers property for opting into specific resource providers.

Micrometer shim

• Bring micrometer shim over from opentelemetry-java-instrumentation. Artifact is available at maven coordinates io.opentelemetry:opentelemetry-micrometer1-shim:1.13.0-alpha.
• Add support for "prometheus mode", enabling better naming when exporting micrometer metrics via prometheus.

Testing

• Add int overload for equalTo attribute assertion.
• Add SpanDataAssert.hasAttribute methods.

Version 1.12.0 (2022-03-03)

This release includes many breaking changes to the metrics SDK as we move towards marking its first stable release. Notably, if you configure metric Views or have written a custom metric exporter, many of the classes and methods will have been moved or renamed. There are still a few remaining cleanups targeted for the next release after which there should not be many. Thanks for bearing with us on this.

API

• New methods have been added to Context to propagate context for common Java 8 callback types
• AttributesBuilder.put now supports vararg versions for lists with AttributeKey
• Multiple metric async callbacks can be registered for the same instrument, and callbacks can be removed

SDK

• An issue with Android desugaring of the SDK has been worked around
• EXPERIMENTAL: Support for disabling resource keys with OTEL_EXPERIMENTAL_RESOURCE_DISABLED_KEYS
• Fixed handling of schemaUrl in Resource.toBuilder()
• BREAKING: Many changes to Data classes used during export
• BREAKING: Many view configuration methods have been removed

Metrics

• APIs deprecated in the previous release have been removed
• DEPRECATION: PrometheusCollector for exporting OpenTelemetry metrics with the prometheus client library has been deprecated
• EXPERIMENTAL: File-based configuration of views
• Prometheus exporter now supports JPMS modules

Logs

• DEPRECATION: LogData.getName has been deprecated for removal

Version 1.11.0 (2022-02-04)

General

• Examples moved to opentelemetry-java-examples

SDK

Exporter

• Switch Jaeger remote sampler to use grpc lite
• Deprecate .setChannel(ManagedChannel) methods on OTLP gRPC exporters
• Deprecate .setChannel(ManagedChannel) methods on Jaeger gRPC exporter
• Experimental OTLP retry support now retries on connection timeouts

Metrics

• BREAKING Change: Deprecated InMemoryMetricExporter and InMemoryMetricReader have been removed. Use versions in opentelemetry-sdk-metrics-testing instead
• Deprecate InstrumentType values OBSERVABLE_SUM and OBSERVABLE_UP_DOWN_SUM in favor of OBSERVABLE_COUNTER and OBSERVABLE_UP_DOWN_COUNTER

Logs

• Add ability to configure log attribute limits via SdkLogEmitterProviderBuilder#setLogLimits(..)

SDK Extensions

• Auto-configuration added options to AutoConfigurationCustomizer for customizing SdkTracerProviderBuilder, SdkMeterProviderBuilder, MetricExporter , SdkLogEmitterProviderBuilder, and LogExporter
• Auto-configuration added option to skip shutdown hooks
• Auto-configuration adjusted the execution order of tracer and meter provider customization to happen after autoconfiguration
• Auto-configuration adjusted SPI factories to evaluate lazily
• Auto-configuration now uses sets configured SdkMeterProvider on BatchLogProcessor and BatchSpanProcessor
• Auto-configuration deprecated SdkTracerProviderConfigurer in favor of AutoConfigurationCustomizer#addTracerProviderCustomizer(..)

Version 1.10.1 (2022-01-21)

Bugfixes

• Fix issue preventing registration of PrometheusCollector with SDK
• Allow retry policy to be set for OkHttpGrpcExporter

Version 1.10.0 (2022-01-07)

API

• Performance of GlobalOpenTelemetry.get improved
• buildWithCallback for asynchronous metrics now return interfaces instead of void. The interfaces are empty but will allow adding functionality in the future
• BREAKING CHANGE: Double/LongMeasurement.observe have been removed
• BREAKING CHANGE: GlobalMeterProvider has been removed
• BREAKING CHANGE: ObservableMeasurement, an empty interface, has been removed. This type was not previously deprecated but is expected to have no use in apps due to the lack of functionality
• The Metrics API has been merged into the opentelemetry-api artifact. OpenTelemetry.getMeterProvider() is the new entrypoint
• BREAKING CHANGE: Bound metrics instruments have been removed for now to allow more time to bake while still providing a stable metrics API
• Double/LongMeasurement.observe has been renamed to record.observe is deprecated in this release
• GlobalMeterProvider has been deprecated. GlobalOpenTelemetry.getMeterProvider should be used instead
• A warning is logged now when registering async instruments with the same name. Previously subsequent invocations were just ignored.
• GlobalOpenTelemetry extended with helpers for meter creation

SDK

• The semantic conventions have been updated to 1.8.0
• Deprecated methods have been removed from the opentelemetry-sdk-autoconfigure artifact.

Exporter

• The OkHttp gRPC exporters now support experimental retry
• OkHttp dispatcher threads are now spawned as daemon threads
• The JPMS module name for the logs exporter has been fixed
• Metrics exporters can have temporality configured
• HTTP exporters now support experimental retry
• Jaeger exporter allows setting trusted certificates
• gRPC exporter metric typos corected

Metrics

• InMemoryMetricExporter has been moved to the opentelemetry-sdk-metrics-testing artifact. The current class has been deprecated in this release
• Metric instrument usage violations consistently report issues as debug logs
• Some user callbacks have been wrapped to catch exceptions instead of throwing
• MinMaxSumCount/Count aggregation has been removed
• Empty aggregator is renamed to drop
• Cumulative aggregations will not be aggressively dropped every collection cycle

Logs

• A opentelemetry-sdk-logs-testing module has been added
• SdkLogEmitterProvider is now available through OpenTelemetrySdk
• LogDataBuilder can now take a SpanContext directly
• SdkLogEmitterProvider.get convenience method added

AWS

• HTTP requests now use OkHttp instead of the JDK

OpenCensus Shim

• Shim span attributes are set before the span is created instead of after
• Exceptions are not thrown when activating a null span

SDK Extensions

• BREAKING CHANGE: Deprecated trace incubator types (DelegatingSpanData, SpanDataBuidler) have been removed
• BREAKING CHANGE: Deprecated ExecutorServiceSpanProcessor has been removed
• cloud.platform is now populated in AWS Resource
• Auto-configuration correctly uses configured class loader for configuring Resource
• Auto-configuration prints a debug log with the resolved tracer configuration
• Auto-configuration supports the logs signal

Version 1.9.1 (2021-11-23)

Bugfixes

• In Prometheus exporter, only populate exemplars for Prometheus types that support them
• Fix proto encoding of oneof values in metrics
• Correctly cleanup OkHttp client resources when shutting down exporters

Version 1.9.0 (2021-11-11)

General

• IMPORTANT: The deprecated io.opentelemetry:opentelemetry-proto module was removed. Java bindings for OTLP protobufs are now published via opentelemetry-proto-java, and available at maven coordinates io.opentelemetry.proto:opentelemetry-proto.

API

• New AttributesBuilder#remove(String) and AttributeBuilder#removeIf(Predicate<AttributeKey<?>>) methods improve ergonomics of modifying attributes.
• W3CBaggagePropagator now encodes baggage values in URL encoded UTF-8 format, per the W3C Baggage Specification.

SDK

• DelegatingSpanData has been promoted from incubation and is now available in the Trace SDK. The DelegatingSpanData class in the io.opentelemetry:opentelemetry-sdk-extension-tracing-incubator module is now deprecated.

Exporters

• The prometheus metric exporter now includes the time_unix_nano representing the epoch timestamp when collection occurred.
• The OTLP grpc exporters (OtlpGrpcSpanExporter, OtlpGrpcLogExporter, and OtlpGrpcMetricExporter) now include a default client implementation (okhttp). If a grpc implementation is detected on the classpath it will be used, but the exporters now work "out of the box" with no additional dependencies.

SDK Extensions

• IMPORTANT: The deprecated io.opentelemetry:opentelemetry-sdk-extension-async-processor module was removed. This module is now published via opentelemetry-java-contrib, and available at maven coordinates io.opentelemetry.contrib:opentelemetry-disruptor-processor.
• The ExecutorServiceSpanProcessor from the io.opentelemetry:opentelemetry-sdk-extension-tracing-incubator module is now deprecated.

Logging (alpha)

• This release includes a rework of the Log SDK to implement OTEP-0150 and to have more symmetry to the Trace SDK. LogSink is now LogEmitter. LogEmitter instances are obtained from SdkLogEmitterProvider. Other additions include MultiLogProcessor (accessed via LogProcessor#composite(...)), SimpleLogProcessor, InMemoryLogExporter , OtlpJsonLoggingLogExporter, and SystemOutLogExporter.
• The Log SDK maven coordinates have changed from io.opentelemetry:opentelemetry-sdk-extension-logging to io.opentelemetry:opentelemetry-sdk-logs.

Metrics (alpha)

• The new InMemoryMetricReader() constructor has been deprecated. Use InMemoryMetricReader.create() instead.
• A typo in Aggregation.explictBucketHistogram() has been fixed, and is now accessible at Aggregation.explicitBucketHistogram().
• The PeriodicMetricReader#builder(MetricExporter) builder replaces PeriodicMetricReader#newMetricReaderFactory(MetricExporter, Duration).
• Aggregation temporality is now influenced by metric exporters, and the ability to configure aggregation temporality via the view API has been removed. For example, the OTLP metric exporters support both DELTA and CUMULATIVE temporality. CUMULATIVE is the default preferred, but this can be changed either via programmatic configuration or via OTEL_EXPORTER_OTLP_METRICS_TEMPORALITY if using autoconfigure.
• The MeterProvider#get(String instrumentationName, String instrumentationVersion, String schemaUrl) method is deprecated. Use MeterProvider#meterBuilder(String instrumentationName) with corresponding builder setters instead.
• Metric cardinality defenses have been added. Each instrument view now can have at most 2000 distinct metric streams per collection cycle. Recordings for additional streams are dropped with a diagnostic log message. Additionally, cumulative metric streams (both for synchronous and asynchronous instruments) are aggressively forgotten each time a metric export occurs that does not include recordings for a particular stream. The net effect is that there is now a cap on metric memory consumption.

Auto-configuration (alpha)

• BREAKING CHANGE: Remove deprecated otel.experimental.exporter.otlp.protocol, otel.experimental.exporter.otlp.{signal}.protocol properties. Please use otel.exporter.otlp.protocol, otel.exporter.otlp.{signal}.protocol instead.
• The autoconfigure module has introduced a powerful new AutoConfiguredOpenTelemetrySdkBuilder, and SPI for programmatically configuring the builder with AutoConfigurationCustomizerProvider. This provides improved ergonomics and control around autoconfigure customization.
• Added experimental support for enabling OTLP retry support for the grpc exporters. If enabled via otel.experimental.exporter.otlp.retry.enabled, a default retry policy will be used.
• The metric export interval of PeriodicMetricReader is now configured via otel.metric.export.interval. The existing otel.imr.export.interval property has been deprecated.
• The SPI classloader can now be specified when using the autoconfigure module programmatically.

Version 1.7.1 (2021-11-03)

Exporters:

• BUGFIX: In 1.7.0, the okhttp-based exporters (OtlpHttpSpanExporter, OtlpHttpMetricExporter, OtlpHttpLogExporter) did not properly close the okhttp response and hence would leak connections. This has been fixed in 1.7.1.

Version 1.7.0 (2021-10-08)

General

• IMPORTANT: The io.opentelemetry:opentelemetry-proto module should now be considered deprecated. It will be removed from publications in a future release. If you need Java bindings for the OTLP protobufs, they are now being published via the new opentelemetry-proto-java repository. They are at new maven coordinates: io.opentelemetry.proto:opentelemetry-proto and versioning is aligned with the released version of the protobuf definitions themselves.

SDK

Exporters

• BREAKING CHANGE: The Jaeger gRPC exporter does not directly use the protobuf-java library for marshaling trace data. Along with this, the opentelemetry-exporter-jaeger artifact does not contain generated protobuf classes for the Jaeger API. If you were using these in your application, you must update your build configuration to also include the new jaeger-proto artifact. This artifact will not be included in a future 2.0 release of the SDK so it is recommended to instead generated the protobuf classes in your own build.
• BREAKING CHANGE: The opentelemetry-exporter-otlp-http-* exporter default endpoint ports have changed from 4317 to 4318, in line with recent changes to the spec.
• The OTLP gRPC exporters will now function without the grpc-java dependency, if okhttp is present on the classpath.
• The (alpha) metrics that are generated by the gRPC exporters have changed slightly. They now have a slightly different instrumentation library name, "io.opentelemetry.exporters.otlp-grpc" and the names of the metrics have also changed. Now emitted are metrics with names otlp.exporter.seen and otlp.exported.exported. Note that it is likely this will change in the future as the metrics semantic conventions are more defined.

Auto-configuration (alpha)

• BREAKING CHANGE: The behavior of otel.exporter.otlp.endpoint has changed when the protocol is http/protobuf. The new behavior is in line with recent changes to the specification, which states that the signal path (e.g. v1/traces or v1/metrics) is appended to the configured endpoint. Values for signal specific endpoint configuration ( e.g. otel.exporter.otlp.traces.endpoint and otel.exporter.otlp.metrics.endpoint) override the generic endpoint configuration and are used as-is without modification.
• The compression option for exporters now explicitly supports the none value, in addition to the existing gzip value.

Metrics (alpha)

• BREAKING CHANGE: The IntervalMetricReader has been removed, and replaced with a PeriodicMetricReader that provides an implementation of the new MetricReader interface.
• This release includes initial support for multiple exporters to be configured for a single SDK instance. See the SdkMeterProviderBuilder.registerMetricReader method for more details.
• This release includes initial support for the SDK recording of Metric Exemplars for sampled Spans. See SdkMeterProviderBuilder.setExemplarFilter and the ExemplarFilter interface for more details.

Logging (alpha)

• This release includes SDK extension interfaces for LogProcessors and LogExporters, and has implementations for batch log processing and export via OTLP. These classes are intended for usage in implementations of log appenders that emit OTLP log entries.

Version 1.6.0 (2021-09-13)

API

• Various performance optimizations
  • 1 and 2 element Attributes instances now bypass some logic to reduce object allocations.
  • The result of hashCode() of AttributeKey is now cached.
  • Checks for base-16 validity of TraceId and SpanId have been optimized.
  • Internally created SpanContext instances now bypass unneeded validation.

Semantic Conventions (alpha)

• The SemanticAttributes and ResourceAttributes classes have been updated to match the semantic conventions as of specification release 1.6.1.

SDK

• The io.opentelemetry.sdk.trace.ReadableSpan interface has been expanded to include a getAttribute(AttributeKey) method.
• The io.opentelemetry.sdk.trace.SpanLimits class now supports enforcing a maximum Span attribute length (measured in characters) on String and String-array values.

Exporters

• The OTLP exporters have been undergone a significant internal rework. Various performance optimizations have been done on process of converting to the OTLP formats.
• The OTLP metric exporter no longer exports the deprecated metric Labels, only Attributes. This means that your collector MUST support at least OTLP version 0.9.0 to properly ingest metric data.
• BREAKING CHANGE: The OtlpHttpMetricExporter class has been moved into the io.opentelemetry.exporter.otlp.http.metrics package.
• BUGFIX: The OtlpGrpcSpanExporter and OtlpGrpcMetricExporter will now wait for the underlying grpc channel to be terminated when shutting down.
• The OTLP exporters now optionally support gzip compression. It is not enabled by default.

SDK Extensions

• The AwsXrayIdGenerator in the opentelemetry-sdk-extension-aws module has been deprecated. This implementation has been superseded by the one in the opentelemetry-java-contrib project and will not be maintained here going forward.

Auto-configuration (alpha)

• The otel.traces.exporter/OTEL_TRACES_EXPORTER option now supports a comma-separated list of exporters.
• The Metrics SDK will no longer be configured by default. You must explicitly request an exporter configuration in order to have a Metrics SDK configured.
• BREAKING CHANGE: All SPI interfaces are now in a separate module from the autoconfiguration module: opentelemetry-sdk-extension-autoconfigure-spi.
• BREAKING CHANGE: ConfigProperties and ConfigurationException have been moved to a new package (io.opentelemetry.sdk.autoconfigure.spi) and module (opentelemetry-sdk-extension-autoconfigure-spi).
• BREAKING CHANGE: All SPI interfaces now take a ConfigProperties instance on their methods.
• BUGFIX: Exceptions thrown during the loading of an SPI implementation class are now handled more gracefully and will not bubble up unless you have explicitly requested the bad implementation as the one to use.
• You can now specify gzip compress for the OTLP exporters via the otel.exporter.otlp.compression /OTEL_EXPORTER_OTLP_COMPRESSION configuration option.
• You can now specify maximum Span attribute length via the otel.span.attribute.value.length.limit /OTEL_SPAN_ATTRIBUTE_VALUE_LENGTH_LIMIT configuration option.

Metrics (alpha)

• BREAKING CHANGES: The metrics SDK has numerous breaking changes, both behavioral and in the SDK's configuration APIs.
  • The default aggregation for a Histogram instrument has been changed to be a Histogram, rather than a Summary.
  • Registration of Views has undergone significant rework to match the current state of the SDK specification. Please reach out on CNCF slack in the #otel-java channel, or in a github discussion if you need assistance with converting to the new Views API.
  • The OTLP exporter no longer exports the deprecated metric Labels, only Attributes. This means that your collector MUST support at least OTLP version 0.9.0 to properly ingest metric data.
  • It is no longer possible to provide custom aggregations via a View. This feature will return in the future.

Version 1.5.0 (2021-08-13)

API

• The io.opentelemetry.context.ContextStorage interface now allows providing a root Context.

SDK

• The io.opentelemetry.sdk.trace.samplers.SamplingResult class has been enhanced with new factory methods for the static result values.
• The io.opentelemetry.exporter.otlp.trace.OtlpGrpcSpanExporter now supports setting custom TLS certificates.
• The io.opentelemetry.sdk.trace.ReadableSpan interface now exposes the parent SpanContext directly.
• The io.opentelemetry.sdk.resources.Resource now exposes a getAttribute(AttributeKey) method to directly retrieve attributes.
• A new opentelemetry-exporter-otlp-http-trace module is now available to support OTLP over HTTP exports.

SDK Extensions

• The opentelemetry-sdk-extension-resources module now provides a new ContainerResource that auto-detects docker container Resource attributes.
• The Jaeger Remote Sampler in the opentelemetry-sdk-extension-jaeger-remote-sampler module is now java.io.Closeable.

Testing

• The SDK testing module (opentelemetry-sdk-testing) has been enhanced with additional assertions for Spans and Attributes.

Auto-configuration (alpha)

• BREAKING CHANGE: io.opentelemetry.sdk.autoconfigure.ConfigProperties in the opentelemetry-sdk-extension-autoconfigure is now an interface and io.opentelemetry.sdk.autoconfigure.OpenTelemetrySdkAutoConfiguration.initiatize() now accepts an optional ConfigProperties instance to add properties to the standard auto-detected ones.
• BREAKING CHANGE: OpenTelemetrySdkAutoConfiguration.getResource() has been removed in favor of using the new OpenTelemetryResourceAutoConfiguration class.
• The opentelemetry-sdk-extension-autoconfigure module now exposes a new OpenTelemetryResourceAutoConfiguration class specifically for acquiring autoconfigured Resource instances.
• The opentelemetry-sdk-extension-autoconfigure module now provides an option to not set the GlobalOpenTelemetry instance when auto-configuring.
• The opentelemetry-sdk-extension-autoconfigure module now has support for signal-specific timeout, header and TLS certificate configuration.
• A new SPI option is available for configuring a metrics exporter. See io.opentelemetry.sdk.autoconfigure.spi.ConfigurableMetricExporterProvider for details.
• A new OTEL_TRACES_SAMPLER/otel.traces.sampler option is available: jaeger_remote.
  • It can be configured using the OTEL_TRACES_SAMPLER_ARG/otel.traces.sampler.arg, which is parsed as a comma-separated map.
    • For example -Dotel.traces.sampler=jaeger_remote -Dotel.traces.sampler.arg=endpoint=192.168.1.5:14250,pollingInterval=5000,initialSamplingRate=0.01

Semantic Conventions (alpha)

• The SemanticAttributes and ResourceAttributes classes have been updated to match the semantic conventions as of specification release 1.5.0.

Metrics (alpha)

• BREAKING CHANGE: The Metrics API has been completely re-written to match the newly specified API. Please reach out on CNCF slack in the #otel-java channel, or in a github discussion if you need assistance with converting to the new API.
• A new opentelemetry-exporter-otlp-http-metrics module is now available to support OTLP over HTTP exports.

Version 1.4.1 (2021-07-15)

• Fill labels in addition to attributes during OTLP metrics export to support versions of the OpenTelemetry Collector which do not support the new protocol yet.

Version 1.4.0 (2021-07-10)

API

Enhancements

• You can now assign an OpenTelemetry schema URL to a Tracer via the new TracerBuilder class that is accessed via the TracerProvider or any of the global instances that delegate to one.

Extensions

• A new @SpanAttribute annotation has been added for adding method parameters to spans automatically. This has no implementation in this release, but should be supported by the auto-instrumentation agent soon.

Exporters

Bugfixes

• Calling shutdown() multiple times on the OTLP and Jaeger GRPC-based exporters will now work correctly and return a proper implementation of CompletableResultCode for the calls beyond the first.

SDK

Bugfixes

• If the jdk.unsupported package is not available, the BatchSpanProcessor will now fall back to a supported, standard Queue implementation.

Enhancements

• A Resource can now be assigned an OpenTelemetry schema URL via the ResourceBuilder or the create(Attributes, String) method on the Resource itself.
• You can now obtain a default Clock based on system time via Clock.getDefault. The sdk-testing artifact also provides a TestClock for unit testing.

Semantic Conventions (alpha)

• The SemanticAttributes and ResourceAttributes classes have been updated to match the semantic conventions as of specification release 1.4.0. These classes also now expose a SCHEMA_URL field which points at the version of the OpenTelemetry schema the files were generated from. There are no breaking changes in this update, only additions.

Metrics (alpha)

• You can now assign an OpenTelemetry schema URL to a Meter via the new MeterBuilder class that is accessed via the MeterProvider or any global instances that delegate to one.
• The metrics SDK now utilizes Attributes rather than Labels internally.
• You can now register an IntervalMetricReader as global and forceFlush the global reader.

Version 1.3.0 (2021-06-09)

API

Enhancements

• Parsing of the W3C Baggage header has been optimized.

SDK

Behavioral Changes

• The implementation of SpanBuilder will no longer throw exceptions when null parameters are passed in. Instead, it will treat these calls as no-ops.

Enhancements

• Memory usage of the Tracing SDK has been greatly reduced when exporting via the OTLP or Jaeger exporters.
• The OTLP protobuf version has been updated to v0.9.0

Extensions

• A new experimental extension module has been added to provide a truly no-op implementation of the API. This is published under the io.opentelemetry.extension.noopapi name.
• The io.opentelemetry.sdk.autoconfigure module now supports the OTEL_SERVICE_NAME/otel.service.name environment variable/system property for configuring the SDK's Resource implementation.

Metrics (alpha)

• The autoconfiguration code for metrics now supports durations to be provided with units attached to them (eg. "100ms"). This includes the following environment variables/system properties:
  • OTEL_EXPORTER_OTLP_TIMEOUT/otel.exporter.otlp.timeout
  • OTEL_IMR_EXPORT_INTERVAL/otel.imr.export.interval

Version 1.2.0 (2021-05-07)

General

Enhancements

• The "Implementation-Version" attribute has been added to the jar manifests for all published jar artifacts.

API

Enhancements

• A new method has been added to the Span and the SpanBuilder to enable adding a set of Attributes in one call, rather than having to iterate over the contents and add them individually. See Span.setAllAttributes(Attributes) and SpanBuilder.setAllAttributes(Attributes)

Behavioral Changes

• Previously, an AttributeKey with a null underlying key would preserve the null. Now, this will be converted to an empty String.

SDK

Enhancements

• The IdGenerator.random() method will now attempt to detect if it is being used in an Android environment, and use a more Android-friendly IdGenerator instance in that case. This will affect any usage of the SDK that does not explicitly specify a custom IdGenerator instance when running on Android.

Behavioral Changes

• The name used for Tracer instances that do not have a name has been changed to be an empty String, rather than the previously used "unknown" value. This change is based on a specification clarification.

Propagators

Bugfixes

• The B3 Propagator injectors now only include the relevant fields for the specific injection format.

Behavioral Changes

• The W3CBaggagePropagator will no longer explicitly populate an empty Baggage instance into the context when the header is unparsable. It will now return the provided Context instance unaltered, as is required by the specification.
• The AwsXrayPropagator will no longer explicitly populate an invalid Span instance into the context when the headers are unparsable. It will now return the provided Context instance unaltered, as is required by the specification.

Exporters

• The jaeger-thrift exporter has had its dependency on the jaeger-client library updated to version 1.6.0.
• The zipkin exporter now has an option to specific a custom timeout.
• The zipkin, jaeger and jaeger-thrift exporters will now report the otel.dropped_attributes_count and otel.dropped_events_count tags if the numbers are greater than zero.

Semantic Conventions (alpha)

Breaking Changes

• The SemanticAttributes and ResourceAttributes have both been updated to match the OpenTelemetry Specification v1.3.0 release, which includes several breaking changes.
• Values that were previously defined as enums are now defined as static public static final constants of the appropriate type.

OpenTracing Shim (alpha)

Enhancements

• Error logging support in the shim is now implemented according to the v1.2.0 specification.

SDK Extensions

• A new HostResource Resource and the corresponding ResourceProvider has been added. It will populate the host.name and host.arch Resource Attributes.
• A new ExecutorServiceSpanProcessor has been added to the opentelemetry-sdk-extension-tracing-incubator module. This implementation of a batch SpanProcessor allows you to provide your own ExecutorService to do the background export work.
• The autoconfigure module now supports providing the timeout setting for the Jaeger GRPC exporter via a system property (otel.exporter.jaeger.timeout) or environment variable (OTEL_EXPORTER_JAEGER_TIMEOUT).
• The autoconfigure module now supports providing the timeout setting for the Zipkin exporter via a system property (otel.exporter.zipkin.timeout) or environment variable (OTEL_EXPORTER_ZIPKIN_TIMEOUT).
• The autoconfigure module now exposes the EnvironmentResource class to provide programmatic access to a Resource built from parsing the otel.resource.attributes configuration property.

Metrics (alpha)

Breaking Changes

• The deprecated SdkMeterProvider.registerView() method has been removed. The ViewRegistry is now immutable and cannot be changed once the SdkMeterProvider has been built.

Bugfixes

• OTLP summaries now have the proper percentile value of 1.0 to represent the maximum; previously it was wrongly set to 100.0.

Enhancements

• There is now full support for delta-aggregations with the LongSumAggregator and DoubleSumAggregator. See AggregatorFactory.sum(AggregationTemporality). The previous AggregatorFactory.sum(boolean) has been deprecated and will be removed in the next release.

Version 1.1.0 (2021-04-07)

API

Bugfixes

• We now use our own internal @GuardedBy annotation for errorprone so there won't be an accidental transitive dependency on a 3rd-party jar.
• The TraceStateBuilder now will not crash when an empty value is provided.

Enhancements

• The Context class now provides methods to wrap java.util.concurrent.Executor and java.util.concurrent.ExecutorService instances to do context propagation using the current context. See io.opentelemetry.context.Context.taskWrapping(...) for more details.

OpenTracing Shim (alpha)

• The shim now supports methods that take a timestamp as a parameter.
• You can now specify both the TEXT_MAP and the HTTP_HEADER type propagators for the shim. See io.opentelemetry.opentracingshim.OpenTracingPropagators for details.

Extensions

• The AWS X-Ray propagator is now able to extract 64-bit trace ids.

SDK

Bugfixes

• The CompletableResultCode.join(long timeout, TimeUnit unit) method will no longer fail the result when the timeout happens. Nor will whenComplete actions be executed in that case.
• The SimpleSpanProcessor now keeps track of pending export calls and will wait for them to complete via a CompletableResultCode when forceFlush() is called. Similarly, this is also done on shutdown().
• The Jaeger Thrift exporter now correctly populates the parent span id into the exporter span.

Enhancements

• The SpanBuilder provided by the SDK will now ignore Link entries that are reference an invalid SpanContext. This is an update from the OpenTelemetry Specification v1.1.0 release.
• The OTLP Exporters will now log more helpful messages when the collector is unavailable or misconfigured.
• The internals of the BatchSpanProcessor have had some optimization done on them, to reduce CPU usage under load.
• The Resource class now has builder() and toBuilder() methods and a corresponding ResourceBuilder class has been introduced for more fluent creation and modification of Resource instances.
• The standard exporters will now throttle error logging when export errors are too frequent. If more than 5 error messages are logged in a single minute by an exporter, logging will be throttled down to only a single log message per minute.

SDK Extensions

Bugfixes

• Removed a stacktrace on startup when using the autoconfigure module without a metrics SDK on the classpath.

Enhancements

• The autoconfigure module now supports OTEL_EXPORTER_OTLP_METRICS_ENDPOINT and OTEL_EXPORTER_OTLP_TRACES_ENDPOINT settings, in addition to the combined OTEL_EXPORTER_OTLP_ENDPOINT environment variable. Corresponding system properties are also supported (-Dotel.exporter.otlp.metrics.endpoint and -Dotel.exporter.otlp.traces.endpoint).
• An SdkMeterProviderConfigurer SPI is now available in the autoconfigure module.

Semantic Conventions (alpha)

• The SemanticAttributes and ResourceAttributes have both been updated to match the OpenTelemetry Specification v1.1.0 release. This includes a breaking changes to the constants defined in the ResourceAttributes class: ResourceAttributes.CLOUD_ZONE has been replaced with ResourceAttributes.CLOUD_AVAILABILITY_ZONE.

Metrics (alpha)

Breaking Changes

• The ViewRegistry now lets you register View objects, rather than AggregatorFactory instances.
• GlobalMetricsProvider has been renamed to GlobalMeterProvider.
• View registration has been moved to the SdkMeterProviderBuilder and the methods on the SdkMeterProvider to add views have been deprecated. They will be removed in the next release.

Enhancements

• A new option for aggregation as Histograms is now available.

Version 1.0.1 (2021-03-11)

Bugfixes

• AWS resource extensions have been fixed to not throw NullPointerException in actual AWS environment

Version 1.0.0 (2021-02-26)

General

This releases marks the first stable release for the tracing, baggage and context APIs and the SDK. Please see the Versioning document for stability guarantees.

The best source of lsit of the now stable packages can be found in the opentelemetry-bom artifact in maven central.

Javadoc is available at javadoc.io. For example, javadoc.io for the API module.

Changes

• The opentelemetry-proto module is now versioned as an alpha module, as it contains non-stable metrics and logs signals. It has hence been removed from the main BOM.
• The opentelemetry-sdk-extension-otproto module has been removed. The classes in it have been moved to a new opentelemetry-exporter-otlp-common module but have been repackaged into an unsupported, internal package.

Metrics (alpha)

Breaking Changes

• PrometheusCollector.Builder inner class has been moved to the top level as PrometheusCollectorBuilder.

Version 0.17.1 (2021-02-19)

• Removed the unused ResourceProvider interface from the SDK. This interface is still available in the opentelemetry-sdk-extension-autoconfigure module, where it is actually used.

Version 0.17.0 (2021-02-17) - RC#3

General

Note: In an effort to accelerate our work toward a 1.0.0 release, we have skipped the deprecation phase on a number of breaking changes. We apologize for the inconvenience this may have caused. We are very aware that these changes will impact users. If you need assistance in migrating from previous releases, please open a discussion topic at https://github.com/open-telemetry/opentelemetry-java/discussions.

Many classes have been made final that previously were not. Please reach out if you have a need to provide extended functionality, and we can figure out how best to solve your use-case.

API

Breaking Changes

• TraceStateBuilder.set(String, String) has been renamed to TraceStateBuilder.put(String, String).
• BaggageBuilder.setParent() and BaggageBuilder.setNoParent() have been removed from the Baggage APIs. In addition, Baggage will no longer be implicitly generated from Baggage that is in the current context. You now must explicitly get the Baggage instance from the Context and call toBuilder() on it in order to get the entries pre-populated in your builder.
• TextMapPropagator.Setter and TextMapPropagator.Getter have been moved to the top level and renamed to TextMapSetter and TextMapGetter respectively.
• OpenTelemetry.getDefault() has been renamed to OpenTelemetry.noop().
• OpenTelemetry.getPropagating() has been renamed to OpenTelemetry.propagating().
• TracerProvider.getDefault() has been renamed to TracerProvider.noop()
• Tracer.getDefault() has been removed.
• TraceId.getTraceIdRandomPart(CharSequence) has been removed.
• The B3Propagator.getInstance() has been renamed to B3Propagator.injectingSingleHeader().
• The B3Propagator.builder() method has been removed. As a replacement, you can use B3Propagator.injectingMultiHeaders() directly.

SDK

Breaking Changes

• The SPI for configuring Resource auto-populators has been removed from the SDK and moved to the opentelemetry-sdk-extension-autoconfigure module. This means that Resource.getDefault() will no longer be populated via SPI, but only include the bare minimum values from the SDK itself. In order to get the auto-configured Resource attributes, you will need to use the opentelemetry-sdk-extension-autoconfigure module directly.
• InstrumentationLibraryInfo.getEmpty() has been renamed to InstrumentationLibraryInfo.empty().
• Resource.getEmpty() has been renamed to Resource.empty().
• When specifying the endpoints for grpc-based exporters, you now are required to specify the protocol. Hence, you must include the http:// or https:// in front of your endpoint.
• The option on SpanLimits to truncate String-valued Span attributes has been removed (this is still pending in the specification).
• The InMemoryMetricsExporter has been removed from the opentelemetry-sdk-testing module.

Miscellaneous

• The default values for SpanLimits have been changed to 128, from 1000, to match the spec.

Extensions

Breaking Changes

• In the opentelemetry-sdk-extension-autoconfigure module, we have changed the system property used to exclude some Resource auto-populators to be otel.java.disabled.resource-providers instead of otel.java.disabled.resource_providers.
• In the opentelemetry-sdk-extension-autoconfigure module, you now specify the OtTracePropagator with the "ottrace" option, rather than "ottracer".
• In the opentelemetry-sdk-extension-autoconfigure module, the default exporters are now set to be "otlp", as required by the 1.0.0 specification.
• In the opentelemetry-sdk-extension-autoconfigure module, the default propagators are now set to be "tracecontext,baggage", as required by the 1.0.0 specification.
• The CommonProperties class has been removed from the opentelemetry-sdk-extension-otproto module.

Metrics (alpha)

API

• Meter.getDefault() has been removed.
• MeterProvider.getDefault() has been renamed to MeterProvider.noop().

Version 0.16.0 (2021-02-08) - RC#2

General

Note: In an effort to accelerate our work toward a 1.0.0 release, we have skipped the deprecation phase on a number of breaking changes. We apologize for the inconvenience this may have caused. We are very aware that these changes will impact users. If you need assistance in migrating from previous releases, please open a discussion topic at https://github.com/open-telemetry/opentelemetry-java/discussions.

Breaking Changes

• Methods and classes deprecated in 0.15.0 have been removed.

API

Breaking Changes

• The Span.Kind enum has been moved to the top level, and named SpanKind.
• DefaultOpenTelemetry is no longer a public class. If you need the functionality previously provided by this implementation, it can be accessed via new static methods on the OpenTelemetry interface itself.
• The TraceFlags interface has been re-introduced. This is now used, rather than a bare byte wherever trace flags is used. In particular, SpanContext.create(), SpanContext.createFromRemoteParent() now require a TraceFlags instance, and SpanContext.getTraceFlags() returns a TraceFlags instance.
• The names of static methods on TraceFlags have been normalized to match other similar classes, and now return TraceFlags instead of byte where appropriate.
• The Labels interface and related classes have been moved into the alpha metrics modules and repackaged.
• TraceId.copyHexInto(byte[] traceId, char[] dest, int destOffset) has been removed.
• SpanContext.getTraceIdAsHexString() has been renamed to SpanContext.getTraceId()
• SpanContext.getSpanIdAsHexString() has been renamed to SpanContext.getSpanId()
• BaggageEntry.getEntryMetadata() has been renamed to BaggageEntry.getMetadata()
• BaggageConsumer has been removed in favor of a standard java.util.function.BiConsumer<String, BaggageEntry>
• TraceFlags.isSampledFromHex(CharSequence src, int srcOffset) has been removed.
• SpanId and TraceId methods that had a String parameter now accept CharSequence and assume the id starts at the beginning.
• SpanId.getSize() and TraceId.getSize() have been removed.
• SpanId.bytesFromHex() has been removed.
• SpanId.asLong(CharSequence) has been removed.
• SpanId.asBytes(CharSequence) has been removed.
• SpanId.getHexLength() has been renamed to SpanId.getLength()
• SpanId.bytesToHex() has been renamed to SpanId.fromBytes()
• TraceId.bytesFromHex() has been removed.
• TraceId.traceIdLowBytesAsLong(CharSequence) has been removed.
• TraceId.traceIdHighBytesAsLong(CharSequence) has been removed.
• TraceId.asBytes(CharSequence) has been removed.
• TraceId.getHexLength() has been renamed to TraceId.getLength()
• TraceId.bytesToHex() has been renamed to TraceId.fromBytes()
• StrictContextStorage has been made private. Use -Dio.opentelemetry.context.enableStrictContext=true` to enable it
• AwsXrayPropagator has been moved to the opentelemetry-extension-aws artifact

Enhancements

• The W3CTraceContextPropagator class now directly implements the TextMapPropagator interface.
• The OpenTelemetry interface now has a getDefault() method which will return a completely no-op implementation.
• The OpenTelmmetry interface now has a getPropagating(ContextPropagators propagators) method which will return an implementation that contains propagators, but is otherwise no-op.

Misc Notes

• The internal StringUtils class has had metrics-related methods removed from it. But, you weren't using internal classes, were you?
• The internal AbstractWeakConcurrentMap class has been made non-public. See the line above about internal classes.

Extensions

Breaking Changes

• The OtTracerPropagator has been renamed to OtTracePropagator in the trace-propagators extension module.

SDK

Breaking Changes

• TraceConfig has been renamed to SpanLimits and relocated to the io.opentelemetry.sdk.tracing package. All related method names have been renamed to match.
• SpanData.getTraceState() has been removed. The TraceState is still available via the SpanContext accessor.
• SpanData.isSampled() has been removed. The isSampled property is still available via the SpanContext accessor.

Enhancements

• SpanData now directly exposes the underlying SpanContext instance.

SDK Extensions

Breaking Changes

• In the opentelemetry-autoconfigure module, three environment variables/system properties have been renamed to match the spec:
  • OTEL_TRACE_EXPORTER/otel.trace.exporter has been replaced with OTEL_TRACES_EXPORTER/otel.traces.exporter
  • OTEL_TRACE_SAMPLER/otel.trace.sampler has been replaced with OTEL_TRACES_SAMPLER/otel_traces_sampler
  • OTEL_TRACE_SAMPLER_ARG/otel.trace.sampler.arg has been replaced with OTEL_TRACES_SAMPLER_ARG/otel.traces.sampler.arg

Enhancements

• The opentelemetry-autoconfigure module now supports using non-millisecond values for duration & interval configuration options. See the javadoc on the io.opentelemetry.sdk.autoconfigure.ConfigProperties.getDuration(String) method for details on supported formats.
• The opentelemetry-autoconfigure module now provides automatic SPI-based parsing of the OTEL_RESOURCE_ATTRIBUTES env var (and the corresponding otel.resource.attributes system property). If you include this module on your classpath, it will automatically update the Resource.getDefault() instance with that configuration.

Metrics (alpha)

API

• The Labels interface has been moved into the metrics API module and repackaged into the io.opentelemetry.api.metrics.common package.

Version 0.15.0 (2021-01-29) - RC#1

General

Breaking Changes

• Methods and classes deprecated in 0.14.x have been removed.

Semantic Conventions

The opentelemetry-semconv module has been marked as -alpha and removed from the bom. This was done because the OpenTelemetry project has not decided on a specification for stability of semantic conventions or the specific telemetry produced by instrumentation.

Deprecations

• The items in the io.opentelemetry.semconv.trace.attributes.SemanticAttributes which were previously generated form the Resource semantic conventions have been deprecated. Please use the ones in the new io.opentelemetry.semconv.resource.attributes.ResourceAttributes class.

Enhancements

• A new io.opentelemetry.semconv.resource.attributes.ResourceAttributes has been introduced to hold the generated semantic attributes to be used in creating Resources.

SDK

Breaking Changes

• SamplingResult.Decision has been removed in favor of the io.opentelemetry.sdk.trace.samplers.SamplingDecision top-level class.
• Resource.merge(Resource) now will resolve conflicts by preferring the Resource passed in, rather than the original.
• The default Resource (accessible via Resource.getDefault()) now includes a fallback service.name attribute. The implication of this is that exporters that have configured fallback service names will only use them if the SDK is intentionally configured with a Resource that does not utilize the default Resource for its underlying Resource data.
• The Sampler is now specified when building the SdkTracerProvider directly, rather than being a part of the TraceConfig.

Bugfixes

• The Jaeger exporters will now properly populate the process service name from the Resource service.name attribute.

Deprecations

• Going forward, OTLP exporter endpoint specifications must include a scheme, either http:// or https://. We will support endpoints without schemes until the next release, at which point not providing a scheme will generate an error when trying to use them. This applies to the use of system properties, environment variables, or programmatic specifications of the endpoints.
• The exportOnlySampled configuration of the BatchSpanProcessor has been deprecated and will be removed in the next release.
• The io.opentelemetry.sdk.resources.ResourceAttributes has been deprecated and will be removed in the next release. Please use the new io.opentelemetry.semconv.resource.attributes.ResourceAttributes class in the opentelemetry-semconv module.
• The serviceName configuration option for the Jaeger and Zipkin exporters has been deprecated. In the next release, those configuration options will be removed, and the fallback service.name will always be pulled from the default Resource.

Enhancements

• Resource.getDefault() now includes a fallback service.name attribute. Exporters that require a service.name should acquire the fallback from the default resource, rather than having it configured in.

SDK Extensions

Breaking Changes

• The otel.bsp.schedule.delay.millis env var/system property configuration option for the batch span processor has been renamed to otel.bsp.schedule.delay to match the specification.
• The otel.bsp.export.timeout.millis env var/system property configuration option for the batch span processor has been renamed to otel.bsp.export.timeout to match the specification.

Enhancements

• The opentelemetry-sdk-extension-autoconfigure module will now additionally register the auto-configured SDK as the instance of GlobalOpenTelemetry when used.
• The opentelemetry-sdk-extension-autoconfigure module now supports the otel.exporter.otlp.certificate configuration property for specifying a path to a trusted certificate for the OTLP exporters.

Version 0.14.1 (2021-01-14)

General

• Several more modules have been updated to have -alpha appended on their versions:
  • opentelemetry-sdk-extension-jfr-events
  • opentelemetry-sdk-extension-async-processor
  • opentelemetry-sdk-extension-logging
  • opentelemetry-sdk-extension-zpages
  • opentelemetry-sdk-exporter-prometheus
  • opentelemetry-sdk-exporter-tracing-incubator
  • opentelemetry-opentracing-shim
  • opentelemetry-opencensus-shim

API

Breaking Changes

• Code that was deprecated in 0.13.0 has been removed from the project.
  • Metrics interfaces are no longer available as a part of the opentelemetry-pom or from the opentelemetry-api modules. To access the alpha metrics APIs, you will need to explicitly add them as a dependency.
  • OpenTelemetry.setPropagators() has been removed. 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.
  • The OpenTelemetry.builder() and the OpenTelemetryBuilder interface have been removed. The builder functionality is now only present on individual implementations of OpenTelemetry. For instance, the DefaultOpenTelemetry class has a builder available.

Deprecations

• The SemanticAttributes class has been moved to a new module: opentelemetry-semconv and repackaged into a new package: io.opentelemetry.semconv.trace.attributes. The old SemanticAttributes class will be removed in the next release.
• The SPI interfaces for OpenTelemetry have been deprecated. We are moving to a new auto-configuration approach with the new SDK auto-configuration module: io.opentelemetry.sdk.autoconfigure. This module should be considered the officially supported auto-configuration library moving forward.

Enhancements

• The SemanticAttributes have been updated to the latest version of the specification, as of January 7th, 2021.

SDK

Bugfixes

• Environment variables/system properties that are used to set extra headers for the OTLP exporters have been fixed to now split on commas, rather than semicolons. This has been brought in line with the specification for these environment variables. This includes otel.exporter.otlp.span.headers, otel.exporter.otlp.metric.headers, and otel.exporter.otlp.headers.
• Passing a null span name when creating a span will no longer cause a NullPointerException. Instead, a default span name will be provided in place of the missing name.

Breaking Changes

• The deprecated SpanData.Link.getContext() method has been removed in favor of SpanData.Link.getSpanContext().
• The TracerProviderFactorySdk SPI class has been renamed to SdkTracerProviderFactory.
• The OpenTelemetrySdkBuilder.build() method has been renamed to OpenTelemetrySdkBuilder.buildAndRegisterGlobal(). The build() method still exists, but no longer sets the instance on the GlobalOpenTelemetry when invoked.
• The SdkTracerManagement.shutdown() method now returns CompletableResultCode which can be used to wait asynchronously for shutdown to complete.
• The sampling.probability sampling attribute previously generated by the TraceIdRatioBasedSampler is no longer generated, as it was not conformant with the specifications.
• The SpanData inner classes have been moved to the top level, so SpanData.Link -> LinkData, SpanData.Event -> EventData and SpanData.Status -> StatusData.

Deprecations

• SdkTracerProvider.updateActiveTraceConfig() and SdkTracerProvider.addSpanProcessor() have been deprecated. The methods will be removed in the next release.
• All existing auto-configuration mechanisms have been deprecated in favor of using the new io.opentelemetry.sdk.autoconfigure module. The existing ones will be removed in the next release.
• The methods with the term "deadline" has been deprecated in the configuration of the grpc-based exporters (OTLP and Jaeger) in favor of the word "timeout". The deadline-named methods will be removed in the next release.
• The StringUtils class in the opentelemetry-extension-trace-propagators extension module has been deprecated and will be made non-public in the next release.
• The StatusData.isUnset() and StatusData.isOk() methods have been deprecated. They will be removed in the next release.

Enhancements

• The OtlpGrpcSpanExporter now supports setting trusted TLS certificates for secure communication with the collector.
• A new module for supporting auto-configuration of the SDK has been added. The new module, io.opentelemetry.sdk.autoconfigure will be the new path for auto-configuration of the SDK, including via SPI, environment variables and system properties.
• The TraceConfig class now exposes a builder() method directly, so you don't need to get the default then call toBuilder() on it.
• The OTLP protobuf definitions were updated to the latest released version: 0.7.0. Both the Span and (alpha) Metric exporters were updated to match.
• Timeouts in the exporters can now be specified with java.util.concurrent.TimeUnit and java.time.Duration based configurations, rather than requiring milliseconds.

SDK Extensions

Breaking Changes

• The ZPages extension now exposes its SpanProcessor implementation. To use it, you will need to add it to your SDK implementation directly, rather than it adding itself to the global SDK instance.
• The JaegerRemoteSampler builder patterns have been changed and updated to more closely match the rest of the builders in the project.

Deprecations

• The AwsXrayIdGenerator constructor has been deprecated in favor of using a simple getInstance() singleton, since it has no state.
• The TraceProtoUtils class in the opentelemetry-sdk-extension-otproto module has been deprecated and will be removed in the next release.

Bugfixes

• The JaegerRemoteSampler now uses the ParentBased sampler as the basis for any sampling that is done.

Metrics (alpha)

SDK:

• The InstrumentSelector.newBuilder() method has been renamed to InstrumentSelector.builder() and the methods on the Builder have changed to use the same naming patterns as the rest of the project.
• The MeterProviderFactorySdk class has been renamed to SdkMeterProviderFactory.
• The SdkMeterProvicer.Builder has been moved to the top level SdkMeterProviderBuilder.
• The InstrumentSelector now requires an instrument type to be provided, and defaults the name regex to .*.

Version 0.13.0 (2020-12-17)

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

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.

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.

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.

Version 0.12.0 (2020-12-04)

API

Bugfixes

• Usages of tracers and meters on all OpenTelemetry instances were being delegated to the global Meter and Tracer. This has been corrected, and all instances should have independent Tracer and Meter instances.

Breaking Changes

• The AttributesBuilder no long accepts null values for array-valued attributes with numeric or boolean types.
• The TextMapPropagator.fields() method now returns a Collection rather than a List.
• Labels has been converted to an interface, from an abstract class. Its API has otherwise remained the same.
• TraceState has been converted to an interface, from an abstract class. Its API has otherwise remained the same.
• Attributes has been converted to an interface, from an abstract class. Its API has otherwise remained the same.
• The ReadableAttributes interface has been removed, as it was redundant with the Attributes interface. All APIs that used or returned ReadableAttributes should accept or return standard Attributes implementations.
• SpanContext has been converted to an interface, from an abstract class. Its API has otherwise remained the same.
• The functional AttributeConsumer interface has been removed and replaced with a standard java.util.function.BiConsumer.
• The signature of the BaggageBuilder.put(String, String, EntryMetadata entryMetadata) method has been changed to put(String, String, BaggageEntryMetadata)

Enhancements

• A builder() method has been added to the OpenTelemetry interface to facilitate constructing implementations.
• An asMap() method has been added to the Attributes interface to enable conversion to a standard java.util.Map.
• An asMap() method has been added to the Baggage interface to enable conversion to a standard java.util.Map.
• An asMap() method has been added to the TraceState interface to enable conversion to a standard java.util.Map.
• The Semantic Attributes constants have been updated to the version in the yaml spec as of Dec 1, 2020.

Miscellaneous

• The HttpTraceContext class has been deprecated in favor of W3CTraceContextPropagator. HttpTraceContext will be removed in 0.13.0.
• The toBuilder() method on the OpenTelemetry interface has been deprecated and will be removed in 0.13.0.
• The DefaultContextPropagators class has been deprecated. Access to it will be removed in 0.13.0.
• The TraceMultiPropagator builder has been deprecated in favor of a simple factory method. The builder will be removed in 0.13.0. You can access the same functionality via static methods on the ContextPropagators interface.
• The setCallback() method on the asynchronous metric instruments has been deprecated and will be removed in 0.13.0. Instead, use the setCallback() method on the builder for the instruments.
• The value() method on the StatusCode enum has been deprecated and will be removed in 0.13.0.
• The Baggage EntryMetadata class has been deprecated in favor of the BaggageEntryMetadata interface. The class will be made non-public in 0.13.0.

Extensions

• The opentelemetry-extension-runtime-metrics module has been deprecated. The functionality is available in the opentelemetry-java-instrumentation project under a different module name. The module here will be removed in 0.13.0.
• The trace-utils module has been deprecated. If you need this module, please let us know! The module will be removed in 0.13.0.

SDK

Breaking Changes

• The opentelemetry-sdk-tracing module has been renamed to opentelemetry-sdk-trace.
• The default port the OTLP exporters use has been changed to 4317.
• The deprecated SpanData.getCanonicalCode() method has been removed, along with the implementations.

Enhancements

• The OpenTelemetrySdk builder now supports the addition of SpanProcessors to the resulting SDK.
• The OpenTelemetrySdk builder now supports the assignment of an IdGenerator to the resulting SDK.
• The ReadableSpan interface now exposes the Span.Kind of the span.
• The SDK no longer depends on the guava library.
• The parent SpanContext is now exposed on the SpanData interface.

Miscellaneous

• The toBuilder() method on the OpenTelemetrySdk class has been deprecated and will be removed in 0.13.0.
• The MultiSpanProcessor and MultiSpanExporter have been deprecated. You can access the same functionality via the SpanProcessor.composite and SpanExporter.composite methods. The classes will be made non-public in 0.13.0.
• The SpanData.hasRemoteParent() method has been deprecated and will be removed in 0.13.0. If you need this information, you can now call SpanData.getParentSpanContext().isRemote().
• The default timeouts for the 2 OTLP exporters and the Jaeger exporter have been changed to 10s from 1s.

Extensions

Breaking Changes

• The opentelemetry-sdk-extension-aws-v1-support module has been renamed to opentelemetry-sdk-extension-aws and the classes in it have been repackaged into the io.opentelemetry.sdk.extension.aws.* packages.

Bugfixes:

• The OpenTracing TracerShim now properly handles keys for context extraction in a case-insensitive manner.

Enhancements

• The opentelemetry-sdk-extension-resources now includes resource attributes for the process runtime via the ProcessRuntimeResource class. This is included in the Resource SPI implementation that the module provides.
• The opentelemetry-sdk-extension-aws extension now will auto-detect AWS Lambda resource attributes.

Version 0.11.0 (2020-11-18)

API

Breaking changes:

• The SPI interfaces have moved to a package (not a module) separate from the API packages, and now live in io.opentelemetry.spi.* package namespace.
• Builder classes have been moved to the top level, rather than being inner classes. For example, rather than io.opentelemetry.api.trace.Span.Builder, the builder is now in its own top-level class: io.opentelemetry.api.trace.SpanBuilder. Methods to create the builders remain in the same place as they were before.
• SpanBuilder.setStartTimestamp, Span.end, and Span.addEvent methods which accept a timestamp now accept a timestamp with a TimeUnit instead of requiring a nanos timestamp.

Enhancements:

• Versions of SpanBuilder.setStartTimestamp, Span.end, and Span.addEvent added which accept Instant timestamps
• Setting the value of the io.opentelemetry.context.contextStorageProvider System property to default will enforce that the default (thread local) ContextStorage will be used for the Context implementation, regardless of what SPI implementations are available.

Miscellaneous:

• Invalid W3C TraceState entries will now be silently dropped, rather than causing the invalidation of the entire TraceState.

SDK

Breaking Changes:

• The builder class for the OpenTelemetrySdk now strictly requires its components to be SDK implementations. You can only build an OpenTelemetrySdk with TracerSdkProvider and MeterSdkProvider instances.

Enhancements:

• An API has been added to the SDK's MeterProvider implementation (MeterSdkProvider) that allows the end-user to configure how various metrics will be aggregated. This API should be considered a precursor to a full "Views" API, and will most likely evolve over the coming months before the metrics implementation is complete. See the javadoc for MeterSdkProvider.registerView() for details.

Miscellaneous:

• The SpanProcessor interface now includes default method implementations for the shutdown() and forceFlush() methods.
• The BatchRecorder implementation has been updated to actually batch the recordings, rather than simply passing them through.

Extensions

Breaking Changes:

• The @WithSpan annotation has been moved to the io.opentelemetry.extension.annotations package in the opentelemetry-extension-annotations module

Bugfixes:

• The memory pool metrics provided by the MemoryPools class in the opentelemetry-extension-runtime-metrics module have been fixed to properly report the committed memory values.

Enhancements:

• A new module has been added to assist with propagating the OTel context in kotlin co-routines. See the opentelemetry-extension-kotlin module for details.

Version 0.10.0 (2020-11-06)

API

Enhancements

• The W3C Baggage Propagator is now available.
• The B3 Propagator now handles both single and multi-header formats.
• The B3 Propagator defaults to injecting the single B3 header, rather than the multi-header format.
• Mutating a method on Span now returns the Span to enable call-chaining.

Bug fixes

• The package-info file was removed from the io.otel.context package because it made the project incompatible with JPMS.

Breaking changes

• There have been many updates to the semantic conventions constants. The constants are now auto-generated from the YAML specification files, so the names will now be consistent across languages. For more information, see the YAML Model for Semantic Conventions.
• All API classes have been moved into the io.opentelemetry.api. prefix to support JPMS users.
• The API no longer uses the grpc-context as the context implementation. It now uses io.opentelemetry.context.Context. This is published in the opentelemetry-context artifact. Interactions with the context were mostly moved to static methods in the Span and Baggage interfaces.
• The Baggage API has been reworked to more closely match the specification. This includes the removal of the BaggageManager. Baggage is fully functional within the API, without needing to install an SDK.
• TracingContextUtils and BaggageUtils were removed from the public API. Instead, use the appropriate static methods on the Span and Baggage classes, or use methods on the Context itself.
• The context propagation APIs have moved into the new opentelemetry-context context module.
• DefaultSpan was removed from the public API. Instead, use Span.wrap(spanContext) if you need a non-functional span that propagates the trace context.
• DefaultMeter, DefaultMeterProvider, DefaultTracer and DefaultTracerProvider were removed from the public API. You can access the same functionality with getDefault() methods on the Meter, MeterProvider, Tracer, and TracerProvider` classes, respectively.
• Some functionality from the Tracer interface is now available either on the Span interface or Context interface.
• The OpenTelemetry class is now an interface, with implementations. Methods on this interface have changed their names to reflect this change. For more information, see OpenTelemetry.java.
• All builder-creation methods have been renamed to .builder().
• StatusCanonicalCode has been renamed to StatusCode.
• Span.getContext() has been renamed to Span.getSpanContext().
• AttributesBuilder now uses put instead of add as the method name for adding attributes.
• All parameters are now marked as non-nullable by default.
• TextMapPropagators could receive a null carrier passed to the extract method.
• The TextMapPropagator.Getter interface has added a method to return the keys that the propagator uses.

SDK

Enhancements

• A new MetricData gauge metric type is now available.
• A new opentelemetry-sdk-testing module with a JUnit 5 extension to assist with testing is now available.
• The Prometheus metric exporter now consumes gauge metrics.
• The Jaeger gRPC exporter now maps Resource entries to process tags.
• The OTLP protobuf definitions were updated to the latest released version: 0.6.0. Both the Span and Metric exporters were updated to match.
• The Sampler interface now allows a Sampler implementation to update the TraceState that is applied to the SpanContext for the resulting span.

Breaking changes

• TraceConfig configuration option names (environment variables and system properties) were renamed to match the OpenTelemetery Specification.
• The Jaeger gRPC exporter was updated to match the OpenTelemetry Specification. The message log entry attribute has been renamed to event and a new dropped attributes count attribute was added. For more information, see the Overview.
• The SpanData.getHasRemoteParent() and SpanData.getHasEnded() methods were renamed to hasRemoteParent() and hasEnded(), respectively.
• The IdsGenerator interface has been renamed to IdGenerator, and all implementations and relevant factory methods were similarly renamed.
• The RandomIdGenerator is now accessible via a factory method on the IdGenerator class, rather than being exposed itself. Use IdGenerator.random() to acquire an instance.
• The OTLP metric exporter now emits gauge metrics where appropriate.
• ValueObserver instruments now generate gauge metrics, rather than non-monotonic counter-style metrics.
• ValueObserver instruments now use the LastValue aggregation instead of MinMaxSumCount.
• The SpanData.* implementation classes were removed from the public SDK, but the interfaces are still available.
• SpanProcessor.onStart now takes a Context as its first parameter.
• The Sampler interface now takes a parent Context rather than a SpanContext.
• Each Sampler has been reorganized into their own classes and moved into the io.opentelemetry.sdk.trace.samplers package. Factory methods that used to be on the Samplers class were moved to the Sampler interface.

Extensions

Enhancements

• A new JUnit5 extension was added for writing tests. For more information, see OpenTelemetryExtension.java.
• A Jaeger SpanExporter which exports via the thrift-over-http protocol is now available.
• A Jaeger Propagator is now available.

Breaking changes

• The in-memory exporter(s) have been moved to the opentelemetry-sdk-testing artifact.
• The OpenTracing shim factory class has been renamed from TraceShim to OpenTracingShim. The factory methods have changed because BaggageManager was removed and non-global OpenTelemetry instances are now available.
• The 's' was removed from the word "exporters" for every exporter artifact. For example, opentelemetry-exporters-logging was renamed to opentelemetry-exporter-logging.
• The 's' was removed from the word "extensions" for the package for every SDK extension. For example, io.opentelemetry.sdk.extensions.otproto.TraceProtoUtils was renamed to io.opentelemetry.sdk.extension.otproto.TraceProtoUtils.

Thanks

Many thanks to everyone who made this release possible!

@anuraaga @bogdandrutu @Oberon00 @thisthat @HaloFour @jkwatson @kenfinnigan @MariusVolkhart @malafeev @trask @tylerbenson @XiXiaPdx @dengliming @hengyunabc @jarebudev @brianashby-sfx

0.9.1 - 2020-10-07

• API

  • BREAKING CHANGE: SpanId, TraceId and TraceFlags are no longer used as instances, but only contain helper methods for managing conversion between Strings, bytes and other formats. SpanId and TraceId are now natively String-typed, and the TraceFlags is a single byte.
  • BREAKING CHANGE: Propagators now only expose a singleton instance.
  • BREAKING CHANGE: The LabelConsumer and AttributeConsumer are now first-class interfaces, and the underlying consumer interface has had the key made additionally generic. Please prefer using the specific interfaces, rather than the underlying ReadableKeyValuePairs.KeyValueConsumer.
  • BREAKING CHANGE: Minimum JDK version has been updated to 8, with Android API level 24.
  • BREAKING CHANGE: Metric Instrument names are now case-insensitive.
  • BREAKING CHANGE: The type-safety on Attributes has been moved to a new AttributeKey, and the AttributeValue wrappers have been removed. This impacts all the semantic attribute definitions, and the various APIs that use Attributes.
  • BREAKING CHANGE: The obsolete HTTP_STATUS_TEXT semantic attribute has been removed.
  • BREAKING CHANGE: The type of the REDIS_DATABASE_INDEX semantic attribute has been changed to be numeric.
  • BREAKING CHANGE: Constant Labels have been removed from metric Instrument definitions.
  • BREAKING CHANGE: The number of available Span Status options has been greatly reduced (from 16 to 3).
  • BREAKING CHANGE: Constant labels have been removed from metric Instrument definitions.
  • BREAKING CHANGE: The only way to specify span parenting is via a parent Context
  • BREAKING CHANGE: The default TextMapPropagator is now a no-op in the API
  • BREAKING CHANGE: CorrelationContext has been renamed to Baggage
  • BREAKING CHANGE: Null-valued span attribute behavior has been changed to being "unspecified".
  • BREAKING CHANGE: Link and Event interfaces have been removed from the API
  • BREAKING CHANGE: The Status object has been removed from the API, in favor of StatusCanonicalCode
  • BUGFIX: the noParent option on a Span was being ignored if it was set after setting an explicit parent.
  • BUGFIX: Attributes and Labels now preserve the latest added entry when an existing key has been used.
  • BUGFIX: Updated some of the W3C traceparent validation logic to better match the spec.
  • FaaS semantic attributes have been added
  • Semantic attribute for "exception.escaped" added

• SDK

  • BREAKING CHANGE: The names of the Sampler.Decision enum values, returned by the Sampler interface, have changed.
  • OpenTelemetrySdk.forceFlush() now returns a CompletableResultCode
  • BREAKING CHANGE: The ProbabilitySampler has been renamed to TraceIdRatioBased
  • BREAKING CHANGE: The environment variables/system properties for specifying exporter and span processor configuration have been updated to match the specification.
  • BREAKING CHANGE: Exported zipkin attributes have been changed to match the specification.
  • BREAKING CHANGE: Metric Descriptor attributes have been flattened into the MetricData for export.
  • BREAKING CHANGE: The OpenTelemetrySdk class now returns a TraceSdkManagement interface, rather than the concrete TracerSdkProvider.
  • BUGFIX: Zipkin span durations are now rounded up to 1 microsecond, if less than 1.
  • BUGFIX: The insecure option for OTLP export now does the correct thing.
  • Added a configuration option for disabling SPI-provided ResourceProviders
  • New incubator module with helper classes for working with SpanData
  • AWS resources now include the cloud.provider attribute.

• Extensions

  • BREAKING CHANGE: Propagators now only expose a singleton instance.
  • The auto-config extension has been moved to the instrumentation project.
  • New incubator module with some utilities for mutating SpanData instances.
  • The AWS Resource extension will now pull in EKS Resource attributes.
  • New pre-release extension for handling logging natively.

Thanks

Many thanks to all who made this release possible:

@bogdandrutu @Oberon00 @jkwatson @thisthat @anuraaga @jarebudev @malafeev @quijote @JasonXZLiu @zoercai @eunice98k @dengliming @breedx-nr @iNikem @wangzlei @imavroukakis

0.8.0 - 2020-09-01

• Extensions:

  • Updated metrics generated by the runtime_metrics module to match the proposed semantic conventions.

• API:

  • BREAKING CHANGE: Renamed HttpTextFormat to TextMapPropagator
  • Added a toBuilder method to the Attributes class
  • Added method to create an Attributes Builder from ReadableAttributes
  • Updates to the Attributes' null-handling to conform to the specification
  • TraceState validations were updated to match the W3C specification
  • recordException Span API now has an additional overload to support additional attributes

• SDK:

  • BUGFIX: Bound instruments with no recordings no longer generate data points.
  • BREAKING CHANGE: The Exporter interfaces have changed to be async-friendly.
  • BREAKING CHANGE: The parent context passed to the Sampler will no longer be nullable, but instead an invalid context will be passed.
  • BREAKING CHANGE: The SpanProcessor now takes a ReadWriteSpan for the onStart method
  • BREAKING CHANGE: ResourceConstants changed to ResourceAttributes
  • BREAKING CHANGE: ParentOrElse Sampler changed to be called ParentBased
  • Default Resource include the SDK attributes
  • ResourceProvider SPI to enable custom Resource providers
  • The individual pieces of the SDK are not published as individual components, in addition to the whole SDK artifact.
  • Zipkin and Jaeger exporters now include the InstrumentationLibraryInfo attributes.
  • The OTLP protobufs were updated to version 0.5.0 and the OTLP exporters were updated accordingly.

• Many thanks for contributions from @anuraaga, @dengliming, @iNikem, @huntc, @jarebudev, @MitchellDumovic, @wtyanan, @williamhu99, @Oberon00, @thisthat, @malafeev, @mateuszrzeszutek, @kenfinnigan

0.7.1 - 2020-08-14

• BUGFIX: OTLP Span Exporter: fix splitting metadata key-value substring with more than one '=' sign

0.7.0 - 2020-08-02

NOTE: This release contains non-backward-compatible breaking SDK changes

• Added an InMemoryMetricExporter
• Added a toBuilder method to Labels
• Added some semantic attribute constants
• New ZPages extension module with TraceZ and TraceConfigZ pages implemented
• Some overloads added for setting the parent Context
• Some performance improvements in HttpTraceContext implementation
• Removed null checks from the Trace APIs
• The bare API will no longer generate Trace and Span IDs when there is no parent trace context.
• Null Strings are no longer valid keys for Attributes
• BREAKING CHANGE: The Sampler API was changed
• Default endpoint is now set for the OTLP exporters
• BREAKING CHANGE: Jaeger exporter env vars/system properties were updated
• Resource attributes may now be set with a System Property as well as the environment variable.
• Added a propagator for Lightstep OpenTracing propagator
• The ZipkinSpanExporter now defaults to using the OkHttpSender
• The default Sampler in the SDK is now the ParentOrElse sampler
• BUGFIX: SpanWrapper SpanData implementation is now truly Immutable
• Added some simple logging for failed export calls
• Quieted the noisy B3 propagator
• Public constants were added for exporter configuration options
• Added a new configuration option to limit the size of Span attributes
• Many thanks for contributions from @anuraaga, @dengliming, @iNikem, @wtyanan, @williamhu99, @trask, @Oberon00, @MitchellDumovic, @FrankSpitulski, @heyams, @ptravers, @thisthat, @albertteoh, @evantorrie, @neeraj97,

0.6.0 - 2020-07-01

NOTE: This release contains non-backward-compatible breaking API and SDK changes

• Introduction of immutable Attributes for SpansEvents, Links and Resources
• Introduction of immutable Labels for Metric Instruments and Recordings
• BUGFIX: make sure null Points are not propagated to metric exporters
• Added a propagator for AWS X-Ray
• BUGFIX: IntervalMetricReader now handles exceptions thrown by metric exporters
• Renamed contrib modules to "extensions" (Note: this changes the published artifact names, as well)
• Converted CorrelationContext entry keys and values to simple Strings
• Enhanced OTLP exporter configuration options
• Added new SDK Telemetry Resource populator
• Introduced an new MultiTracePropagator to handle multiple propagation formats
• Added new AWS Resource populators
• Added an extension to populate span data into log4j2 log formats.
• Changed the MinMaxSumCount aggregations for ValueRecorders to always aggregate deltas, rather than cumulative
• Updated the OTLP protobuf and exporter to version 0.4.0 of the OTLP protobufs.

0.5.0 - 2020-06-04

TODO: fill this out

• Add helper API to get Tracer/Meter

0.4.0 - 2020-05-04

• Initial implementation of the Zipkin exporter.
• Breaking change: Move B3 propagator to a contrib package
• Add support for Jaeger propagator
• Start implementing support for configuring exporters using Config pattern with support to load from environment variables and system properties.
• Add support to flush the entire SDK processors and exporter pipelines.
• Mark all threads/pools as daemon.
• Add support for Jaeger remote sampler.

0.3.0 - 2020-03-27

• Initial Java API and SDK for context, trace, metrics, resource.
• Initial implementation of the Jaeger exporter.
• Initial implementation of the OTLP exporters for trace and metrics.