1.16.0-M1

⚠️ Noteworthy

• Remove deprecated io.micrometer.core.lang annotations #6407
• Register JCache cache.removals as a FunctionCounter by default #2754

⭐ New Features

• Add KeyName.withNoneValue() #6125
• Add getAll to Getter for repeated metadata #6312
• Enhance logging of negative amount in AbstractTimer.record() by printing stack trace #6530
• Flag to register JCache cache.removals as FunctionCounter #6471
• Improved Meter.Id#getTags() performance #6182
• Jakarta Mail instrumentation #5985
• Log requests as trace level for OtlpMeterRegistry #6514
• Make KafkaMetrics refresh interval configurable #6319
• Migrate to JSpecify annotations for nullability constraints #5547
• Provide meter count in HighCardinalityTagsDetector #6510
• StackdriverConfig option to not create metric descriptors #6281
• Use String.replace() where possible #6449

🐞 Bug Fixes

• Distribution without percentiles always has value 0 in Stackdriver #6401
• Incompatible with slf4j 2 in OSGi #6406
• LongTaskTimer#measure does not return max duration #6421
• Return NaN for null KafkaMetrics values #6324
• Scrape failure when conflicting meter types are registered #6434
• ValueResolver and ValueExpressionResolver nullability is inconsistent #6280

📔 Documentation

• Polish Javadoc from gh-6319 #6376

🔨 Dependency Upgrades

• Bump software.amazon.awssdk:cloudwatch from 2.31.41 to 2.31.78 #6525
• Bump io.prometheus:prometheus-metrics-bom from 1.3.6 to 1.3.10 #6523
• Bump com.google.cloud:libraries-bom from 26.60.0 to 26.63.0 #6497
• Bump com.netflix.spectator:spectator-reg-atlas from 1.8.12 to 1.8.16 #6482
• Bump com.google.cloud:google-cloud-monitoring from 3.63.0 to 3.68.0 #6474
• Bump com.google.auth:google-auth-library-oauth2-http from 1.34.0 to 1.37.1 #6437
• Bump dropwizard-metrics from 4.2.30 to 4.2.33 #6436
• Bump io.dropwizard.metrics5:metrics-core from 5.0.0 to 5.0.1 #6435
• Bump io.opentelemetry.proto:opentelemetry-proto from 1.5.0-alpha to 1.7.0-alpha #6290

📝 Tasks

• Remove optional jsr305 dependency where not needed #6493
• Make benchmark module require at least Java 17 #6469
• Missing @NullMarked #6433
• Deprecate micrometer-commons nullability annotations in favor of jSpecify #6425
• Add JDK 24 build job #6400
• Update japicmp config for 1.16.0 development #6242

❤️ Contributors

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

@etki, @Shaderbug, @MemencioPerez, @famaridon, @izeye, @msqr, and @thonra

1.15.2

⭐ New Features

• Flag to register JCache cache.removals as FunctionCounter #6471
• Log requests as trace level for OtlpMeterRegistry #6514
• Use String.replace() where possible #6449

🐞 Bug Fixes

• Distribution without percentiles always has value 0 in Stackdriver #6401
• Incompatible with slf4j 2 in OSGi #6406
• LongTaskTimer#measure does not return max duration #6421
• Return NaN for null KafkaMetrics values #6324
• Scrape failure when conflicting meter types are registered #6434

❤️ Contributors

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

@izeye, and @msqr

1.14.9

⭐ New Features

• Log requests as trace level for OtlpMeterRegistry #6514
• Use String.replace() where possible #6449
• Flag to register JCache cache.removals as FunctionCounter #6471

🐞 Bug Fixes

• Distribution without percentiles always has value 0 in Stackdriver #6401
• Incompatible with slf4j 2 in OSGi #6406
• LongTaskTimer#measure does not return max duration #6421
• Return NaN for null KafkaMetrics values #6324
• Scrape failure when conflicting meter types are registered #6434

❤️ Contributors

@izeye, @msqr
Thank you to all the contributors who worked on this release:

1.15.1

🐞 Bug Fixes

• IndexProviderFactory throws ConcurrentModificationException #6243
• Make InstrumentationVerificationTests compatible with JUnit 5.13 and earlier versions #6344
• gRPC client interceptor incorrectly registers status CANCELLED as error #6261

🔨 Dependency Upgrades

• Bump software.amazon.awssdk:cloudwatch from 2.31.41 to 2.31.58 #6372
• Bump com.netflix.spectator:spectator-reg-atlas from 1.8.12 to 1.8.14 #6336
• Bump dropwizard-metrics from 4.2.30 to 4.2.32 #6307
• Bump io.prometheus:prometheus-metrics-bom from 1.3.7 to 1.3.8 #6306
• Bump io.prometheus:prometheus-metrics-bom from 1.3.6 to 1.3.7 #6241

📝 Tasks

• Remove AtomicReference from StatsdMeterRegistryTest #6311
• Remove java11Test setup from micrometer-test #6293
• Polish StatsD line builders #6285
• Improve StatsD tests #6284
• Resolve StringSplitter from Error Prone #6271
• Resolve EqualsGetClass from Error Prone #6263
• Resolve ClassCanBeStatic from Error Prone #6253
• Resolve InlineFormatString from Error Prone #6232
• Add more tests for TimedHandler #6227
• Replace TimeUtils usage to TimeUnit where applicable #6224

❤️ Contributors

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

@izeye, @kwondh5217, @cfredri4, and @ngocnhan-tran1996

1.14.8

🐞 Bug Fixes

• IndexProviderFactory throws ConcurrentModificationException #6243
• Make InstrumentationVerificationTests compatible with JUnit 5.13 and earlier versions #6344
• gRPC client interceptor incorrectly registers status CANCELLED as error #6261

🔨 Dependency Upgrades

• Bump com.netflix.spectator:spectator-reg-atlas from 1.8.13 to 1.8.14 #6341
• Bump dropwizard-metrics from 4.2.30 to 4.2.32 #6304
• Bump io.prometheus:prometheus-metrics-bom from 1.3.6 to 1.3.8 #6305

📝 Tasks

• Remove AtomicReference from StatsdMeterRegistryTest #6311
• Remove java11Test setup from micrometer-test #6293
• Polish StatsD line builders #6285
• Improve StatsD tests #6284
• Resolve StringSplitter from Error Prone #6271
• Resolve EqualsGetClass from Error Prone #6263
• Resolve ClassCanBeStatic from Error Prone #6253
• Resolve InlineFormatString from Error Prone #6232
• Add more tests for TimedHandler #6227
• Replace TimeUtils usage to TimeUnit where applicable #6224

❤️ Contributors

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

@izeye, @kwondh5217, @cfredri4, and @ngocnhan-tran1996

1.13.15

🐞 Bug Fixes

• Make InstrumentationVerificationTests compatible with JUnit 5.13 and earlier versions #6344
• gRPC client interceptor incorrectly registers status CANCELLED as error #6261

🔨 Dependency Upgrades

• Bump dropwizard-metrics from 4.2.30 to 4.2.32 #6300

📝 Tasks

• Remove AtomicReference from StatsdMeterRegistryTest #6311
• Remove java11Test setup from micrometer-test #6293
• Polish StatsD line builders #6285
• Improve StatsD tests #6284
• Resolve StringSplitter from Error Prone #6271
• Resolve EqualsGetClass from Error Prone #6263
• Resolve ClassCanBeStatic from Error Prone #6253
• Resolve InlineFormatString from Error Prone #6232
• Add more tests for TimedHandler #6227
• Replace TimeUtils usage to TimeUnit where applicable #6224

❤️ Contributors

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

@izeye, @kwondh5217, @cfredri4, and @ngocnhan-tran1996

1.15.0

Below includes changes from all milestones and release candidates for the 1.15.0 release.

⭐ 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

1.14.7

⭐ New Features

• Replace Meter.Id.getTags() with cheaper alternatives #6147

🐞 Bug Fixes

• MultiGauge doesn't work with MeterFilter.map() #6146
• Record cache.size in CaffeineCacheMetrics without enabling recordStats() #6128
• TimedHandler shutdown hanging indefinitely #6194
• Use snapshot consistently in AppOpticsMeterRegistry.writeSummary() #6181

❤️ Contributors

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

@AlexElin, @RafeArnold, and @izeye

1.13.14

⭐ New Features

• Replace Meter.Id.getTags() with cheaper alternatives #6147

🐞 Bug Fixes

• MultiGauge doesn't work with MeterFilter.map() #6146
• TimedHandler shutdown hanging indefinitely #6194
• Use snapshot consistently in AppOpticsMeterRegistry.writeSummary() #6181

❤️ Contributors

Thank you to all the contributors who worked on this release:
@AlexElin, @RafeArnold, and @izeye

1.15.0-RC1

⭐ New Features

• Further enhancement to OtlpMetricsSender #6025
• Make Prometheus Metric and Label naming conventions consistent #5923
• Metrics for Executors.newVirtualThreadPerTaskExecutor() #5488
• More flexible OTLP per meter configuration #6099
• Prometheus/OpenMetrics _created timestamp #2625
• Metrics for live virtual threads #5950

🐞 Bug Fixes

• Gauge double registration warning for Kafka metrics #5757
• Log warning about "function" meter re-registration #6070
• micrometer-observation-test brings unnecessary JUnit dependencies, leading to conflicts #6012

❤️ Contributors

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

@izeye