code: func ForPlugin(name string) PluginLogger {
  	if logger, found := DefaultRegistry.Lookup(name); found {
  		DefaultLogger.Debugf("using plugin logger for %q that was already initialized", name)
  		return &ParentLogger{
  			Logger:  logger,
  			Prefix:  name,
  			Factory: DefaultRegistry,
  		}
  	}
  	return NewParentLogger(name, DefaultRegistry)
  }
docs: // ForPlugin is used to initialize plugin logger by name
  // and optionally created children (their name prefixed by plugin logger name)