Version 1.22.0

API

• WARNING: GlobalOpenTelemetry trigger of autoconfiguration is now opt-in. Previously, GlobalOpenTelemetry.get triggered autoconfiguration if opentelemetry-sdk-extension-autoconfigure was detected on the classpath. That behavior is now opt-in by setting environment variable OTEL_JAVA_GLOBAL_AUTOCONFIGURE_ENABLED=true. (#5010)
• Update LoggerBuilder, MeterBuilder, TracerBuilder javadoc (#5050)

Context

• Make closing scope idempotent and non-operational when corresponding context is not current. (#5061)

SDK

• Standardize internal usage of ConfigUtil for reading environment variables and system properties (#5048)

Metrics

• Lazily initialize exponential histogram buckets (#5023)
• Delete MapCounter alternative exponential histogram implementation (#5047)
• Add toString to SdkMeter, SdkObservableInstrument, AbstractInstrumentBuilder (#5072)

Exporter

• OtlpGrpcSpanExporter, OtlpHttpSpanExporter, OtlpGrpcLogRecordExporter, OtlpHttpLogRecordExporter, ZipkinSpanExporter, and JaegerGrpcSpanExporter are now instrumented with GlobalOpenTelemetry by default. Instrumentation initializes lazily to prevent ordering issue of accessing GlobalOpenTelemetry.get before GlobalOpenTelemetry.set is called. (#4993)
• Add ConfigurableSpanExporterProvider implementation for JaegerGrpcSpanExporter (#5002)
• Add ConfigurableSpanExporterProvider, ConfigurableMetricExporterProvider, ConfigurableLogRecordExporterProvider for OtlpGrpc{Signal}Exporters and OtlpHttp{SignalExporters (#5003)
• Replace OTLP User-Agent spaces with dashes (#5080)
• Add AutoConfigurationCustomizerProvider implementation for PrometheusHttpServer (#5053)
• Add resource target_info and scope target_info metrics to PrometheusHttpServer in compliance with spec (#5039)
• Drop delta metrics in PrometheusHttpServer (#5062)
• PrometheusHttpServer drops metrics with same name and different type (#5078)

SDK Extensions

• DEPRECATION: Align autoconfigure exemplar filter names with spec. Previous names none, all, with_sampled_trace are deprecated. Use always_off, always_on, trace_based instead. (#5063)

OpenTracing Shim

• Add createTracerShim function (#4988)

🙇 Thank you

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

@amouhadi
@brunobat
@carlosalberto
@cuichenli
@dashpole
@deejgregor
@jack-berg
@jkwatson
@lmolkova
@mateuszrzeszutek
@Oberon00
@RajatArora08
@trask
@vasireddy99
@yangtaoran