Support for OTEL Synchronous Gauge

[ivan-zaitsev]

Expected behavior

import io.opentelemetry.api.GlobalOpenTelemetry;
import io.opentelemetry.api.incubator.metrics.ExtendedLongGaugeBuilder;
import io.opentelemetry.api.incubator.metrics.LongGauge;

LongGauge gauge = ((ExtendedLongGaugeBuilder) GlobalOpenTelemetry.getMeter("meter").gaugeBuilder("gauge").ofLongs()).build();
gauge.set(1);

Otel PR: open-telemetry/opentelemetry-java#5506

Actual behavior

java.lang.ClassCastException: class io.opentelemetry.javaagent.instrumentation.opentelemetryapi.v1_10.metrics.ApplicationLongGaugeBuilder cannot be cast to class io.opentelemetry.api.incubator.metrics.ExtendedLongGaugeBuilder (io.opentelemetry.javaagent.instrumentation.opentelemetryapi.v1_10.metrics.ApplicationLongGaugeBuilder and io.opentelemetry.api.incubator.metrics.ExtendedLongGaugeBuilder are in unnamed module of loader 'app')

System information

SDK version: 3.5.1
Spring boot version 3.2.4

[trask]

hi @ivan-zaitsev, it looks like you may be using older versions of OpenTelemetry API and OpenTelemetry Incubator, can you double check that you are using 1.36.0 for both io.opentelemetry:opentelemetry-api and io.opentelemetry:opentelemetry-api-incubator

also double check that the Spring dependency management isn't overriding the dependency versions you specify, check out https://opentelemetry.io/docs/languages/java/instrumentation/#dependency-management

[ivan-zaitsev]

Thanks @trask I will be able to try it next week.

[ivan-zaitsev]

With last 3.5.2 version it works. I think that it uses opentelemetry-runtime-attach-core 1.34.0-alpha.
With version 3.5.1 it doesn't work. It uses opentelemetry-runtime-attach-core 1.32.0-alpha.