Introduce HTTP OTLP exporter

[geoand]

The integration utilizes the HttpSender
interface introduced in OTel 1.28
and is based on the Vert.x HTTP Client

Closes: #21535

[quarkus-bot]

/cc @brunobat (opentelemetry), @radcortez (opentelemetry)

[geoand]

@yrodiere I am seeing:

Error: Class initialization of org.h2.fulltext.FullTextLucene failed. This error is reported at image build time because class org.h2.fulltext.FullTextLucene is registered for linking at image build time by command line Use the option --initialize-at-run-time=org.h2.fulltext.FullTextLucene to explicitly request delayed initialization of this class.
Original exception that caused the problem: java.lang.NoClassDefFoundError: org/apache/lucene/index/IndexFormatTooOldException

in the main integration test and it should be completely unrelated to this PR (or at least I don't see how it could be related)

[yrodiere]

I'm back from two weeks out of office, so take this with a grain of salt, but all I can say is that I didn't see any change related to H2 recently, nor did I ever see any use of Lucene in Quarkus Core (let alone H2).

I suppose your changes might be introducing code that makes GraalVM think that FullTextLucene is reachable, even if it's not.

But be aware there is (used to be?) a bug in GraalVM in which the firsts static init error was ignored and GraalVM still proceeds and generates tons of seemingly nonsensical errors as a result. See oracle/graal#6368
EDIT: I originally reported the problem there, and I think the issue description includes instructions on how to debug this stuff.

I can have a look at some point, but I hope it's not too urgent as I'm still catching up with emails and (lots of) PRs that I need to review to get others unstuck.

EDIT: FWIW there's also this entry in H2's reflect-config.json, but personally I'd rather bet on the GraalVM bug.

[yrodiere]

Ah wait, I'm seeing this elsewhere, so it's not limited to this PR.

I guess I know what I'll do with my day :)

[yrodiere]

The caused seems to be there: #34615 (comment)

[geoand]

Thanks for the super quick investigation!

[brunobat]

Looks good to me. Thanks @geoand !

[geoand]

🙏🏼

[rsvoboda]

@geoand Could you pls open PR for docs?

[geoand]

@rsvoboda not sure what you are asking for

[rsvoboda]

This is new feature/enhancement, bu this PR didn't add anything into docs/guides.
Could you extend otel related guide(s) with information about OTLP/HTTP option?

[geoand]

That's probably best done by @brunobat who has all the OpenTelemetry context

[brunobat]

I already did here:
https://quarkus.io/guides/opentelemetry#default
Please let me know if additional clarification is needed @rsvoboda

PS: PR #35465

[rsvoboda]

Thanks Bruno. We have a note, should be good for now. It can be extended if people need more details.