Metrics not work for node sites.

Author: kporras07

src/Commands/Env/MetricsCommand.php

@@ -84,6 +84,12 @@ public function metrics(
             'datapoints' => 'auto',
         ]
     ) {
+        $site = $this->getSiteById($site_env);
+        if ($site->isNodejs()) {
+            throw new TerminusException(
+                'Metrics are not yet available for Node.js sites.'
+            );
+        }
         $env = $this->getOptionalEnv($site_env);
         if (null !== $env) {
             $metrics = $env->getEnvironmentMetrics()
@@ -95,8 +101,7 @@ public function metrics(
                 )
                 ->serialize();
         } else {
-            $metrics = $this->getSiteById($site_env)
-                ->getSiteMetrics()
+            $metrics = $site->getSiteMetrics()
                 ->setDuration(
                     $this->selectDatapoints(
                         $options['datapoints'],