print nodes for those metrics is somehow unreachable

pkg/kubectl/metricsutil/metrics_printer.go

@@ -76,6 +76,12 @@ func (printer *TopCmdPrinter) PrintNodeMetrics(metrics []metricsapi.NodeMetrics,
 			Metrics:   usage,
 			Available: availableResources[m.Name],
 		})
+		delete(availableResources, m.Name)
+	}
+
+	// print lines for nodes of which the metrics is unreachable.
+	for nodeName := range availableResources {
+		printMissingMetricsNodeLine(w, nodeName)
 	}
 	return nil
 }
@@ -171,6 +177,14 @@ func printMetricsLine(out io.Writer, metrics *ResourceMetricsInfo) {
 	fmt.Fprint(out, "\n")
 }
 
+func printMissingMetricsNodeLine(out io.Writer, nodeName string) {
+	printValue(out, nodeName)
+	for i := 0; i < len(MeasuredResources); i++ {
+		printValue(out, "-\t-\t")
+	}
+	fmt.Fprint(out, "\n")
+}
+
 func printValue(out io.Writer, value interface{}) {
 	fmt.Fprintf(out, "%v\t", value)
 }