We need a rule to replace the annotation on the service consumer class

When critera: javaclass references="io.quarkus.grpc.runtime.annotations.GrpcService"
location:annotation

Category: mandatory
SP: 1
Title: The io.quarkus.grpc.runtime.annotations.GrpcService annotation was renamed to io.quarkus.grpc.GrpcClient
Message: Furthermore, the @GrpcClient.value() is optional and the service name can be derived from the annotated element.
Quarkus - Migration Guide 2.0

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I think the second aspect to this is the implementation of the service

Files with name
src/main/proto/*.proto

Category: potential
SP:1
Title: If a class implements a gPRC service then replace the annotation javax.inject.Singleton with io.quarkus.grpc.GrpcService
Message: gRPC service classes now have to be annotated with @io.quarkus.grpc.GrpcService instead of @javax.inject.Singleton.
Quarkus - Migration Guide 2.0