code: func (proxier *Proxier) OnEndpointsUpdate(oldEndpoints, endpoints *v1.Endpoints) {
  	if proxier.endpointsChanges.Update(oldEndpoints, endpoints) && proxier.isInitialized() {
  		proxier.syncRunner.Run()
  	}
  }
docs: // OnEndpointsUpdate is called whenever modification of an existing endpoints object is observed.