GrpcServerObservationAutoConfiguration Bean should use custom GrpcServerObservationConvention

[rafal-dudek]

GrpcServerObservationAutoConfiguration should use ObjectProvider<GrpcServerObservationConvention> to create ObservationGrpcServerInterceptor bean.
Additionally, @ConditionalOnMissingBean annotation would be appreciated.

Currently, we need to exclude GrpcServerObservationAutoConfiguration and create bean by ourselves, to use custom GrpcServerObservationConvention.

Similar behaviour is already done for the client interceptor: https://github.com/spring-projects/spring-grpc/blob/main/spring-grpc-client-spring-boot-autoconfigure/src/main/java/org/springframework/boot/grpc/client/autoconfigure/GrpcClientObservationAutoConfiguration.java
But for server interceptor it is using hardcoded default convention: https://github.com/spring-projects/spring-grpc/blob/main/spring-grpc-server-spring-boot-autoconfigure/src/main/java/org/springframework/boot/grpc/server/autoconfigure/GrpcServerObservationAutoConfiguration.java

[therepanic]

Hi, @rafal-dudek. Thanks for pointing this out. It's a very useful and cute note that will help us make both configurations consistent.

Please note that we are migrating autoconfiguration to Spring Boot (#49043), and this will take some time. After that, I believe we will migrate all the commits currently present in this repo. All PRs containing fixes/enchancements can be considered demos of sorts 😄

[philwebb]

Transferred issue from spring-grpc to spring-boot. We will triage this issue against the updated codebase in due course.

[therepanic]

This issue fixed via #49730

[wilkinsona]

Duplicates #49730.