code: func computeKubeletVersions(nodes []v1.Node) map[string]uint16 {
  	kubeletVersions := map[string]uint16{}
  	for _, node := range nodes {
  		kver := node.Status.NodeInfo.KubeletVersion
  		if _, found := kubeletVersions[kver]; !found {
  			kubeletVersions[kver] = 1
  			continue
  		}
  		kubeletVersions[kver]++
  	}
  	return kubeletVersions
  }
docs: // computeKubeletVersions returns a string-int map that describes how many nodes are of a specific version