Quarkus does not send warning when TraceRequest fails for `quarkus.otel.exporter.otlp.protocol=http/protobuf`

[LarsSven]

Describe the bug

In Quarkus, if you use OpenTelemetry with the default gRPC sender, if your trace request fails, you get a message such as:

2025-06-24 13:43:13,806 WARNING [io.qua.ope.run.exp.otl.sen.VertxGrpcSender] (vert.x-eventloop-thread-4) Failed to export TraceRequestMarshalers. The request could not be executed. Full error message: Connection refused: localhost/127.0.0.1:4317

However, if you switch to http/protobuf through

quarkus.otel.exporter.otlp.protocol=http/protobuf

Requests fail silently without sending any warning

Expected behavior

A warning should be given for the http/protobuf protocol if it fails to send a TraceRequest

Actual behavior

No log message is sent to indicate that something went wrong.

How to Reproduce?

1. Create a Quarkus application with the OpenTelemetry extension
2. Send a request to a non-existing endpoint and observe the warning log
3. Set quarkus.otel.exporter.otlp.protocol=http/protobuf
4. Send a request to a non-existing endpoint and observe no log message at all.

Output of uname -a or ver

Ubuntu 25.04

Output of java -version

OpenJDK 21.0.7

Quarkus version or git rev

3.23.4

Build tool (ie. output of mvnw --version or gradlew --version)

Gradle 8.14.2

Additional information

No response

[quarkus-bot]

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

[geoand]

Could you try with #48573?

[LarsSven]

I just built that branch locally, it indeed works with that change @geoand

[geoand]

Thanks for checking! @brunobat PTAL at #48573