This Stackoverflow question piqued my interest: retry policy configuration for grpc not working Service Config in gRPC is new to me but, my initial suspicion (albeit incorrect) was that the JSON types were incorrect. I decided to try using the Protocol Buffer source service_config.proto to verify the JSON. To do so I needed to compile the source…. it was gnarly. There are 2 repos used: googleapis grpc-proto The service_config.proto includes options for java_package but no go_package.