code: func setLogLevel(backend core.ConfigBackend) {
  	loggingLevelString, _ := backend.Lookup("client.logging.level")
  	logLevel := logging.INFO
  	if loggingLevelString != nil {
  		var err error
  		logLevel, err = logging.LogLevel(loggingLevelString.(string))
  		if err != nil {
  			panic(err)
  		}
  	}
  
  	// TODO: allow separate settings for each
  	for _, logModule := range logModules {
  		logging.SetLevel(logModule, logLevel)
  	}
  }
docs: // setLogLevel will set the log level of the client