⭐ New Features

• Avoid global publishing alignment in OTLP registry #3794
• Avoid needing compiler parameter metadata in CountedAspect #3780
• Reduces overall memory allocation in DynatraceExporterV2 while exporting #3766
• Consistently add outcome tag to all HTTP client instrumentation #3729
• Migrate from Application Insights instrumentation keys to connection strings #3710
• Add supplier variant for Observation.Context.getOrDefault() #3708
• Allow custom sink for LoggingMeterRegistry #3685
• Make cumulative count computations in takeCountSnapshot more efficient #3581
• Configurable aggregation temporality for OTLP registry #3145
• @Timed annotation with dynamic tags derived from input arguments and/or output #1732
• Metrics support for Netty allocators and event executors #522
• Adds hasAnObservation assertion that allows doing arbitrary assertions + clear method #3679
• Add GC name to gc pause metric #3670
• Add metrics for the total number of application threads started in the JVM #3562
• Jetty Client instrumentation with Observation API #3416
• Add support for using new Elasticsearch \_index\_template endpoint for creating index templates. #3320
• OSGi enabled micrometer jars so that they can be deployed as OSGi bundles #3149
• Publish partial step values on application shutdown for step meters #1882
• OTLP registry custom header support #3546
• Add method Observation.observe(Function<C extends Observation.Context, T> function) #3537
• Add support for Azul Prime's (Zing) C4 (GPGC) #2982
• Apache HttpClient 5.x support #2513
• Use Meter.Id for logging in DynatraceExporterV2 #3616

🐞 Bug Fixes

• Set current scope on ObservationRegistry when Scope#makeCurrent is called #3808
• Enclosing scope not being popped #3787
• MicrometerHttpClientInterceptor has no outcome Tag #3790
• OTLP registry publishes incorrect delta values on close #3773
• OTLP delta histogram bucket counts are not aligned to the time window #3772
• Max does not follow the specification for OTLP delta histogram #3771
• StepMeterRegistry closed near a step boundary may lose data #3720
• PushMeterRegistry scheduled publish can collide with publish on close #3711
• Avoid global publishing alignment #2818

📝 Tasks

• Reduce Regex object creation in SignalFx Naming Convention #3747
• Improve StepBucketHistogram #3793
• Polish MeterTag changes #3769
• Add time units to OTel integration tests #3796
• Upgrade to Gradle Wrapper 8.1.1 #3784

❤️ Contributors

Thank you to all the contributors who worked on this release:

@asasas234, @lenin-jaganathan, @cbismuth, @kubamarchwicki, @ThePumpingLemma, @izeye, @jprinet, @pirgeo, @mborgraeve, @taer, @belks, and @ttddyy