1.18.0-M1

⚠️ Noteworthy

• Replace the OpenTelemetry protobuf library #5658
• Add config option to compress Datadog payload #2297

⭐ New Features

• Optimize PrometheusMeterRegistry and MicrometerCollector snapshot collection #7802
• Skip registering JCache meters when statistics are not enabled #7562
• Fail collision validation at registration instead of at scrape with typed Prometheus family descriptors #7487
• Prometheus: unnecessary allocation and validation performed on every scrape #7450
• Bump Kotlin target from 1.8 to 2.0 #7338
• Add option for time-based FunctionCounter #7329
• Remove lastScope field and deprecated implementations from SimpleObservation #7273
• Replace the OpenTelemetry protobuf library #5658
• KeyValue support for Observation.Event #5238
• Add config option to compress Datadog payload #2297

🐞 Bug Fixes

• OTLP publishing fails if a cumulative LongTaskTimer present with a histogram #7830
• Race condition in registry searching and MeterNotFoundException creation may result in a failure that looks as if it should have succeeded #2307
• ClassNotFoundException: org.LatencyUtils.PauseDetector is thrown when introspecting AbstractTimer #7815
• Prometheus custom meters: creation timestamps are incorrect #7798
• Fix memory leak/NPE in MicrometerHttpClientInterceptor (HC4 & HC5)
• Sanitize line terminators in Dogstatsd, Etsy StatsD, and LoggingMeterRegistry

🔨 Dependency Upgrades

• Bump io.netty:netty-bom from 4.2.15.Final to 4.2.17.Final #7819
• Bump software.amazon.awssdk:cloudwatch from 2.46.5 to 2.51.3 #7818
• Bump com.google.cloud:libraries-bom from 26.83.0 to 26.86.0 #7794
• Bump com.google.auth:google-auth-library-oauth2-http from 1.48.0 to 1.50.0 #7793
• Bump com.google.cloud:google-cloud-monitoring from 3.94.0 to 3.96.0 #7790
• Bump com.netflix.spectator:spectator-reg-atlas from 1.9.9 to 1.10.5 #7792
• Bump org.jetbrains.kotlinx:kotlinx-coroutines-core from 1.7.3 to 1.11.0 #7476
• Bump io.prometheus:prometheus-metrics-bom from 1.7.0 to 1.8.0 #7615

📝 Tasks

• Add sample to print out OTLP output in a human readable format #7832
• Fix ineffective ExemplarSampler cache in DefaultExemplarSamplerFactory #7657
• Note micrometer-jetty11 deprecation in the artifact description #7651

❤️ Contributors

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

@arimu1, @kalayciburak, antonio-pedro99, @jewoodev, @zeitlinger, schiemon, and @m-burst