metropolis/cli/metroctl: don't print usage for runtime errors

Change-Id: I91fdca45e874ea1ec9112df556a9a7392fd45bfd
Fixes: https://github.com/monogon-dev/monogon/issues/352
Reviewed-on: https://review.monogon.dev/c/monogon/+/3440
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/cli/metroctl/cmd_node_metrics.go b/metropolis/cli/metroctl/cmd_node_metrics.go
index f3bde46..0842c24 100644
--- a/metropolis/cli/metroctl/cmd_node_metrics.go
+++ b/metropolis/cli/metroctl/cmd_node_metrics.go
@@ -39,7 +39,7 @@
 
 `,
 	Use:  "metrics [node-id] [exporter]",
-	Args: cobra.MinimumNArgs(2),
+	Args: PrintUsageOnWrongArgs(cobra.MinimumNArgs(2)),
 	RunE: func(cmd *cobra.Command, args []string) error {
 		ctx := cmd.Context()