Clarify and flesh out OpenTelemety support in Helidon SE

[barchetta]

Our support for OpenTelemetry in Helidon SE should be clarified and fleshed out (in MP it is dictated by the MicroProfile specification). Specifically:

• Fix configuration related issues for tracing as described in Add support for OpenTelemetry configuration in Helidon SE #9595
• Add support for OpenTelemetry tracing semantic conventions (which spans we create automatically, what names and tags they have, etc.) Also done in Add support for OpenTelemetry configuration in Helidon SE #9595.
• Add doc for telemetry config. 4.3.x Add doc page for incubating feature for OpenTelemetry config and tracing semantic conventions #10556

Targeted for 4.4:

• Enhance use of tracing config and TracerBuilder for the Helidon OpenTelemetry tracing provider. 4.x - Allow users to use tracing config with the Helidon OpenTelemetry tracing provider #10790
• Allow otel as a choice for tracing in the archetype custom project type. Add support in archetypes for OpenTelemetry as a tracing choice #10788
• Update OpenTelemetry version and semantic conventions version. Update OpenTelemetry dependency version #10396
• Decide what, if anything, we want to do for OpenTelemetry Metrics Add support for OpenTelemetry metrics #10765
• Decide what, if anything, we want to do for OpenTelemetry Logs

[SentryMan]

Will automatic agent instrumentation for SE also be added as part of this effort?

[tjquinno]

@SentryMan Please explain what you mean by this. Are you asking whether Helidon will be added to the list of "supported" libraries for the Otel agent? https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/docs/supported-libraries.md

That's a possibility.

Our focus is likely to first be on:

• allowing Helidon SE users to use Helidon config to set up OpenTelemetry behavior (as they can somewhat with MP today)
• adding some support in SE (exactly what that means is being planned now) for:
  • OTel metrics
  • OTel logging

Agent support for Helidon would be nice to have and might come later.

[SentryMan]

Indeed that's what I'm asking, a while ago I made an issue for it #8964 but it doesn't seem to have gone anywhere.

[SentryMan]

Agent support for Helidon would be nice to have and might come later.

So I'm trying to add helidon to the agent now, but I can't seem to find a way to return [the route path template] easily (https://javadoc.io/static/io.opentelemetry.instrumentation/opentelemetry-instrumentation-api-semconv/1.33.2-alpha/io/opentelemetry/instrumentation/api/instrumenter/http/HttpServerAttributesGetter.html#getHttpRoute(REQUEST)).

[tjquinno]

See also #10022