OTel metrics for Microprofile Telemetry 2.0

[brunobat]

Provides OpenTelemetry metrics according to https://github.com/eclipse/microprofile-telemetry/blob/2.0/spec/src/main/asciidoc/metrics.adoc

[quarkus-bot]

/cc @radcortez (opentelemetry)

[brunobat]

Will include the TCK updates as well... Set to draft until then.

[github-actions]

🎊 PR Preview 7f5dc76 has been successfully built and deployed to https://quarkus-pr-main-43678-preview.surge.sh/version/main/guides/

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[Ladicek]

Off topic (but not all that much I guess): are you planning to support MetricsCapabilityBuildItem? (And the related SPIs too, probably?)

[brunobat]

Off topic (but not all that much I guess): are you planning to support MetricsCapabilityBuildItem? (And the related SPIs too, probably?)

I'll decide that after evaluating the future Micrometer to OpenTelemetry bridge.
It it goes well, there might be no more automatic metrics for OTel.

[brunobat]

#43752 is needed for the native image tests to pass because it includes an OTel side instrumentation fix.

[quarkus-bot]

Status for workflow Quarkus Documentation CI

This is the status report for running Quarkus Documentation CI on commit cd37073.

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It should be safe to merge provided you have a look at the other checks in the summary.

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[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit cd37073.

Failing Jobs

Status	Name	Step	Failures	Logs	Raw logs	Build scan
✖	Native Tests - Misc4	Build	Failures	Logs	Raw logs	🔍

Full information is available in the Build summary check run.
You can consult the Develocity build scans.

Failures

⚙️ Native Tests - Misc4 #

- Failing: integration-tests/opentelemetry 

📦 integration-tests/opentelemetry

✖ io.quarkus.it.opentelemetry.MetricsIT.testJvmMetrics - History - More details - Source on GitHub

org.awaitility.core.ConditionTimeoutException: Condition with Lambda expression in io.quarkus.it.opentelemetry.MetricsTest was not fulfilled within 10 seconds.
	at org.awaitility.core.ConditionAwaiter.await(ConditionAwaiter.java:167)
	at org.awaitility.core.CallableCondition.await(CallableCondition.java:78)
	at org.awaitility.core.CallableCondition.await(CallableCondition.java:26)
	at org.awaitility.core.ConditionFactory.until(ConditionFactory.java:1006)
	at org.awaitility.core.ConditionFactory.until(ConditionFactory.java:975)
	at io.quarkus.it.opentelemetry.MetricsTest.testJvmMetrics(MetricsTest.java:77)
	at java.base/java.lang.reflect.Method.invoke(Method.java:569)