public void patchTraces(
        com.google.devtools.cloudtrace.v1.PatchTracesRequest request,
        io.grpc.stub.StreamObserver<com.google.protobuf.Empty> responseObserver) {
      io.grpc.stub.ClientCalls.asyncUnaryCall(
          getChannel().newCall(getPatchTracesMethod(), getCallOptions()),
          request,
          responseObserver);
    }
<pre>
Sends new traces to Stackdriver Trace or updates existing traces. If the ID
of a trace that you send matches that of an existing trace, any fields
in the existing trace and its spans are overwritten by the provided values,
and any new fields provided are merged with the existing trace data. If the
ID does not match, a new trace is created.
</pre>
java-trace/grpc-google-cloud-trace-v1/src/main/java/com/google/devtools/cloudtrace/v1/TraceServiceGrpc.java