code: func LevelFilter() *logutils.LevelFilter {
  	return &logutils.LevelFilter{
  		Levels:   []logutils.LogLevel{"TRACE", "DEBUG", "INFO", "WARN", "ERR"},
  		MinLevel: "INFO",
  		Writer:   ioutil.Discard,
  	}
  }
docs: // LevelFilter returns a LevelFilter that is configured with the log
  // levels that we use.