Sometimes it's important to get the list of fields from Protobuf message.
The good example is Kafka with Protobuf serialiser - when the code generator to Java isn't used - but desc file should be generated anyway. It worse to invest into pact testing of the produced messages - check if the number of sent fields is within the range of defined in proto schema.
Unfortunately Protobuf for JVM doesn't support reading metadata from proto files, but if it's compiled to desc file - it's possible to read it via JVM API - that isn't intuitive:
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