The context

I'd like to get the metric values for grpc.server.processing.duration and distinguish different status codes, e.g. OK, NOT_FOUND, INVALID_ARGUMENT, UNKNOWN

The bug

If my gRPC service is called three times, and it responds twice with an OK status and once with with an NOT_FOUND status, I'd expect the tags that are captured for the metrics grpc.server.processing.duration to be "OK" and "NOT_FOUND".
But instead, the "NOT_FOUND" error seems to be reported as an "UNKNOWN" error.

Stacktrace and logs

I don't know

Steps to Reproduce

I created a very simple example project, with one gRPC service and one GrpcAdvice that translates my "business" exception into a NOT_FOUND status.

Please check out the integration test, that shows how to reproduce the issue: https://github.com/harti2006/grpc-metrics-demo/blob/trunk/src/test/java/com/github/harti2006/grpc/metrics/GrpcMetricsDemoApplicationTests.java

The application's environment

Which versions do you use?

• Spring (boot): 2.7.5
• grpc-java: 1.51.0
• grpc-spring-boot-starter: 2.14.0.RELEASE
• java: 11

Additional context

• It used to work fine with the previous release 2.13.1.RELEASE. When downgrading to this version, the above mentioned integration test works fine