code: func (r *RemoteRuntimeService) UpdateRuntimeConfig(runtimeConfig *runtimeapi.RuntimeConfig) error {
  	ctx, cancel := getContextWithTimeout(r.timeout)
  	defer cancel()
  
  	// Response doesn't contain anything of interest. This translates to an
  	// Event notification to the network plugin, which can't fail, so we're
  	// really looking to surface destination unreachable.
  	_, err := r.runtimeClient.UpdateRuntimeConfig(ctx, &runtimeapi.UpdateRuntimeConfigRequest{
  		RuntimeConfig: runtimeConfig,
  	})
  
  	if err != nil {
  		return err
  	}
  
  	return nil
  }
docs: // UpdateRuntimeConfig updates the config of a runtime service. The only
  // update payload currently supported is the pod CIDR assigned to a node,
  // and the runtime service just proxies it down to the network plugin.