Process tags show as span tags in Jaeger viewer with helidon-tracing-jaeger

[RickyFrost]

The Jaeger viewer shows spans created with helidon-tracing-jaeger as "span tags" when they were added as tracer tags. This is a change from Helidon v2 jaeger support. Is it possible to add process tags as before? What is the way to do that?

Environment Details

• Helidon Version: v3.2.1 SE
• JDK version: 17.0.5
• OS: OL7
• Docker version (if applicable): n/a

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Problem Description

When I use TracerBuilder::addTracerTag in Helidon 2 they appear as a "process" tag in the Jaeger trace viewer.
In Helidon 3 (with helidon-tracing-jaeger) they appear instead as "span" tags. I'm concerned that the change in storage class may be an issue. I'm also concerned about this visual flattening making it more difficult to view (visually parse) spans in devops triages.

The only items that show up as "process" tags are: hostname, ip, jaeger.version, and service.name.
fyi, the following tags are added to every span: otel.library.name, and otel.scope.name

Steps to reproduce

    @Test void processVsSpanTag() {
        final var tracer = io.helidon.tracing.TracerBuilder.create(Config.create().get("tracing"))
                .registerGlobal(true).enabled(true)
                .addTracerTag("tracerTag", "TracerValue") // Should appear as a "process" tag
                .build();
        final var span = tracer.spanBuilder("processVsSpanTag")
                .tag("spanTag", "SpanValue")              // Should appear as a "span" tag
                .start();
        System.out.println("Use viewer to examine processVsSpanTag in trace: "+span.context().traceId());
        span.end();
    }

As an alternative to the code approach above, I instead added them to the config as follows (same result):

tracing:
  tags:
    tracerTag: TracerValue