1.15.0

⭐ New Features

• Further enhancement to OtlpMetricsSender #6025
• Make Prometheus Metric and Label naming conventions consistent #5923
• Metrics for Executors.newVirtualThreadPerTaskExecutor() #5488
• Metrics for live virtual threads #5950
• More flexible OTLP per meter configuration #6099
• Prometheus/OpenMetrics _created timestamp #2625
• Make jvm.classes.unloaded description generic #5745
• Use String.toLowerCase()/toUpperCase() with Locale.ROOT consistently #5711
• Use failWithActualExpectedAndMessage() where possible #5696
• Provide target host/port info in ObservationExecChainHandler when HttpHostConnectException is thrown #5615
• Enable Gauge builders to take a subclass of Number #5601
• micrometer-observation-test support for assertions on events #5576
• Log delta count in addition to throughput in LoggingMeterRegistry #5548
• Add peer name and port to gRPC observation contexts #3512
• Use direct equals call instead of Objects.equals wrapper #5840
• Remove special handling of 404/301 from JDK HTTP client instrumentation #5838
• Make Timer and LongTaskTimer output similar in LoggingMeterRegistry #5835
• Remove special handling of 404 and redirection statuses from Jetty client instrumentation #5825
• Log deprecation warning when creating SignalFxMeterRegistry #5824
• Log metrics recording failures in CountedAspect and TimedAspect #5820
• Remove special handling of 404/301 from OkHttp instrumentation #5814
• Support AutoShutdownDelegatedExecutorService in ExecutorServiceMetrics #5811
• Deprecate micrometer-registry-signalfx in favor of micrometer-registry-otlp #5807
• Rebind Log4j2Metrics when LoggerContext#reconfigure is called #5756
• Send metrics via any protocol in the OTLP Registry #5690
• Improve average performance of DefaultLongTaskTimer for out-of-order stopping #5591
• Improve OtlpMetricsSender API #5994
• Support configuring exponential histograms at the meter level #5459
• Allow TimedAspect/CountedAspect to create tags based on method result #3058

🐞 Bug Fixes

• Do not leak OTLP types on public-facing API #5699
• micrometer-observation-test brings unnecessary JUnit dependencies, leading to conflicts #6012

🔨 Dependency Upgrades

• Bump io.opentelemetry.proto:opentelemetry-proto from 1.4.0-alpha to 1.5.0-alpha #5798
• Bump com.google.cloud:libraries-bom from 26.55.0 to 26.56.0 #5991
• Bump com.google.cloud:google-cloud-monitoring from 3.59.0 to 3.60.0 #5986
• Bump com.google.auth:google-auth-library-oauth2-http from 1.32.1 to 1.33.0 #5963
• Bump software.amazon.awssdk:cloudwatch from 2.29.46 to 2.30.11 #5863

❤️ Contributors

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

@izeye, @ngocnhan-tran1996, @s-ste, @ttddyy, @big-cir, @breedx-splk, @fogninid, @turbanoff