code: func BatchAddCounter(name string, delta uint64) {
  	if metricBatcher == nil {
  		return
  	}
  	metricBatcher.BatchAddCounter(name, delta)
  }
docs: // BatchAddCounter adds delta to a counter but, unlike AddCounter, does not emit a
  // CounterEvent for each add; instead, the adds are batched and a single CounterEvent
  // is sent after the timeout.