There is no suitable category now.
kvproto should be moved to tikv org, and coprocessor related proto definition should be moved to tipb.
Prefer to define a new service named Coprocessor in tipb, and move some rpcs to it.
rpc Coprocessor(coprocessor.Request) returns (coprocessor.Response) {}
rpc CoprocessorStream(coprocessor.Request) returns (stream coprocessor.Response) {}
rpc BatchCoprocessor(coprocessor.BatchRequest) returns (stream coprocessor.BatchResponse) {}
Then move kvproto to tikv org.