Method newStream

core/src/main/java/io/grpc/internal/GrpcUtil.java:725–735

(
            MethodDescriptor<?, ?> method, Metadata headers, CallOptions callOptions,
            ClientStreamTracer[] tracers)

      }
      return new ClientTransport() {
        @Override
        public ClientStream newStream(
            MethodDescriptor<?, ?> method, Metadata headers, CallOptions callOptions,
            ClientStreamTracer[] tracers) {
          StreamInfo info = StreamInfo.newBuilder().setCallOptions(callOptions).build();
          ClientStreamTracer streamTracer =
              streamTracerFactory.newClientStreamTracer(info, headers);
          checkState(tracers[tracers.length - 1] == NOOP_TRACER, "lb tracer already assigned");
          tracers[tracers.length - 1] = streamTracer;
          return transport.newStream(method, headers, callOptions, tracers);
        }

        @Override
        public void ping(PingCallback callback, Executor executor) {