Expected Behavior

OpenTelemetry client http span should contain the status_code attribute when an error response is returned.

Actual Behaviour

When either the low-level or the declarative Micronaut HTTP client call ends with an HttpClientResponseException, the client span will not contain any attributes derived from the HttpResponse, i.e. status code, content length, captured response headers or the error.type.

This happens because OpenTelemetryClientFilter passes null as response to the OpenTelemetry instrumenter when an exception was caught, even though the response object might be inside that exception in certain cases (HttpClientResponseException). In this case OpenTelemetry never sees the HttpResponse instance, thus cannot extract attributes from it.

Steps To Reproduce

Run the test added in this commit: lgathy@8a6b7db

Environment Information

• Operating System: Debian 12
• JDK Version: OpenJDK 17.0.14

Example Application

No response

Version

Micronaut Tracing 6.9.0