code: func (ps *Plugins) Register(name string, plugin Factory) {
  	ps.lock.Lock()
  	defer ps.lock.Unlock()
  	if ps.registry != nil {
  		_, found := ps.registry[name]
  		if found {
  			klog.Fatalf("Admission plugin %q was registered twice", name)
  		}
  	} else {
  		ps.registry = map[string]Factory{}
  	}
  
  	klog.V(1).Infof("Registered admission plugin %q", name)
  	ps.registry[name] = plugin
  }
docs: // Register registers a plugin Factory by name. This
  // is expected to happen during app startup.