code: func (ds *dockerService) UpdateRuntimeConfig(_ context.Context, r *runtimeapi.UpdateRuntimeConfigRequest) (*runtimeapi.UpdateRuntimeConfigResponse, error) {
  	runtimeConfig := r.GetRuntimeConfig()
  	if runtimeConfig == nil {
  		return &runtimeapi.UpdateRuntimeConfigResponse{}, nil
  	}
  
  	klog.Infof("docker cri received runtime config %+v", runtimeConfig)
  	if ds.network != nil && runtimeConfig.NetworkConfig.PodCidr != "" {
  		event := make(map[string]interface{})
  		event[network.NET_PLUGIN_EVENT_POD_CIDR_CHANGE_DETAIL_CIDR] = runtimeConfig.NetworkConfig.PodCidr
  		ds.network.Event(network.NET_PLUGIN_EVENT_POD_CIDR_CHANGE, event)
  	}
  
  	return &runtimeapi.UpdateRuntimeConfigResponse{}, nil
  }
docs: // UpdateRuntimeConfig updates the runtime config. Currently only handles podCIDR updates.