code: func (al *archiveLogger) LogSummary(ctx context.Context, hits, misses int64, bytesHit, bytesPushed units.Size, digests []string) {
  	end := time.Now()
  
  	if !al.quiet {
  		duration := end.Sub(al.start)
  		fmt.Fprintf(os.Stderr, "Hits    : %5d (%s)\n", hits, bytesHit)
  		fmt.Fprintf(os.Stderr, "Misses  : %5d (%s)\n", misses, bytesPushed)
  		fmt.Fprintf(os.Stderr, "Duration: %s\n", units.Round(duration, time.Millisecond))
  	}
  }
docs: // LogSummary logs (to eventlog and stderr) a high-level summary of archive operations(s).