code: func (logger *Logger) WaitForUnprocessedRecords() {
  	runtime.Gosched()
  	var (
  		diff     uint64
  		diffPrev uint64
  		i        uint8
  	)
  	for {
  		diff = atomic.LoadUint64(&logger.countIn) - atomic.LoadUint64(&logger.countOut)
  		if diff == diffPrev {
  			i++
  		}
  		if i >= 100 {
  			return
  		}
  		if diff > 0 {
  			diffPrev = diff
  			time.Sleep(10 * time.Millisecond)
  		} else {
  			return
  		}
  	}
  }
docs: // WaitForUnprocessedRecords block execution until all unprocessed log records
  // for this logger are processed.
  // In order to wait for processing in all loggers, logging.WaitForAllUnprocessedRecords
  // can be used.