message: Drop metrics req
diff: @@ -56,6 +56,10 @@ function workerThread() {
  intervalCounter.set(time - lastDumpTs);
  lastDumpTs = time;
  const dump = msg.substr('metricsdump:'.length);
  + if (res.finished) {
  + // Sometimes a message will come in far too late because we've already
  + // sent an empty response. Drop it here.
  + }
  res.writeHead(200);
  writeAndEnd(res, `${dump}\n${registry.metrics()}`);
  });
  