add node metric example

example/metric.js

@@ -0,0 +1,38 @@
+'use strict';
+
+var signalflow = require('../');
+
+var token = process.env['SPLUNK_ACCESS_TOKEN'];
+var realm = process.env['SPLUNK_REALM'] || 'us0';
+
+var sfxClient = new signalflow.SignalFlow(token, {
+  signalflowEndpoint: 'wss://stream.' + realm + '.signalfx.com',
+  apiEndpoint: 'https://api.' + realm + '.signalfx.com'
+});
+
+function receive() {
+  var program = "data('cpu.utilization').publish()";
+  console.log('signalflow: ', program);
+
+  var handle = sfxClient.execute({
+    program: program,
+    start: Date.now() - 60000,
+    stop: Date.now() + 60000,
+    resolution: 10000,
+    immediate: false,
+  });
+
+  handle.stream(function (err, data) {
+    if (err) {
+      console.log(err);
+      return;
+    }
+
+    if (data.type === 'data') {
+      data.data.forEach(function (dataPoint) {
+        console.log('value received: ', dataPoint);
+      });
+    }
+  });
+}
+receive();