This release targets the OpenTelemetry SDK 1.55.0.

Note that many artifacts have the -alpha suffix attached to their version number, reflecting that they are still alpha quality and will continue to have breaking changes. Please see the VERSIONING.md for more details.

⚠️ Breaking Changes

• Hadoop JMX metrics have been renamed to align with semantic conventions. If you are using Hadoop JMX metrics, you will need to update your dashboards and alerts. (#14411)
• Lettuce 5.1 instrumentation now aligns with other instrumentations and no longer sets the span status description. (#14886)

🚫 Deprecations

• The following Logback appender configuration properties have been renamed for clarity. The old property names have been deprecated and will be removed in a future release: - Java agent: otel.instrumentation.logback-appender.experimental.capture-logstash-attributes → otel.instrumentation.logback-appender.experimental.capture-logstash-marker-attributes - Spring Boot starterotel.instrumentation.logback-appender.experimental.capture-logstash-markers → otel.instrumentation.logback-appender.experimental.capture-logstash-marker-attributes - Logback appender configuration property: captureLogstashAttributes → captureLogstashMarkerAttributes - Logback appender API: setCaptureLogstashAttributes() → setCaptureLogstashMarkerAttributes() (#14959)

🌟 New javaagent instrumentation

• Add Helidon instrumentation (#13776)
• Add NATS instrumentation (#13999)
• OpenSearch Transport v3.0 Implementation (#14823)
• Add Kafka Connect API instrumentation (#14478)

🌟 New library instrumentation

• Add Helidon Instrumentation (#13776)
• Add NATS instrumentation (#13999)
• Failsafe 3.0 instrumentation introduced (#14057)

📈 Enhancements

• Add experimental sqlcommenter support for JDBC and R2DBC (#13714)
• Align Hadoop JMX metrics with semantic conventions (#14411)
• Introduce experimental API for operation attributes to be passed only to OperationListeners (#14590)
• Add span logging support for declarative configuration (#14591)
• Add span logging support for Spring Boot starter (#14594)
• Support capturing event names in logback, log4j, and jboss-logmanager appenders (#14649)
• Include contrib sampler in java agent, e.g. for filtering health check endpoints (#14677)
• Collect RPC metrics in Apache Dubbo instrumentation (#14690)
• Add experimental option to disable noisy redis.encode span events in Lettuce instrumentation (#14750)
• Support ListIterator in Kafka consumer instrumentation for Spark Structured Streaming (#14757)
• Exclude wrapper classes in JDBC instrumentation (#14760)
• Support JDBC URL parsing for OceanBase, PolarDB, and Lindorm databases (#14790)
• Support context propagation in Guava AsyncEventBus (#14791)
• Make db.statement attribute available during sampling in Lettuce instrumentation (#14856)
• Add code.namespace and code.function attributes to Vaadin controller spans (#14882)
• Add code.namespace and code.function attributes to Grails controller spans (#14885)
• Support Hibernate 7.2.0.CR1 (#14921)
• Support capturing Logstash StructuredArguments as log record attributes (#14959)
• Add gRPC request/response size metrics (#14342)

🛠️ Bug fixes

• Fix datasource instrumentation to support connection pools like Druid (#14602)
• Fix Java HTTP client instrumentation to properly propagate request cancellation (#14747)
• Fix Reactor Netty HTTP client instrumentation to handle IllegalStateException (#14778)
• Fix executor context propagation when a stateless lambda instance is passed multiple times (#14841)
• Remove span status description from Lettuce 5.1 instrumentation (#14886)
• Fix Spring Boot autoconfiguration ordering for micrometer bridge (#15011)

🙇 Thank you

This release was possible thanks to the following contributors who shared their brilliant ideas and awesome pull requests:

@1095071913 @AlixBa @asarkar @asweet-confluent @breedx-splk @changliu-wk @copilot-swe-agent @crossoverJie @damienburke @defields923 @ericmm @ghilainm @grcevski @hoteye @igor-suhorukov @jack-berg @jaydeluca @jiten686 @JonasKunz @jonatan-ivanov @laurit @LikeTheSalad @LiouChong @malafeev @maxxedev @MrCull @mznet @neilfordyce @nenadnoveljic @onurkybsi @patpatpat123 @pepeshore @philsttr @robsunday @SentryMan @sorobon @steffan-westcott @steverao @survivant @SylvainJuge @tjquinno @trask @vasantteja @wl2027 @xiangtianyu @xuminwlt @zeitlinger