Adding performance tracing

app.js

@@ -5,7 +5,23 @@ var app = express();
 
 // Initalize Sentry (import library and instantiate)
 const Sentry = require('@sentry/node');
-Sentry.init({ dsn: 'https://[email protected]/1366275'});
+const Tracing = require('@sentry/tracing');
+
+Sentry.init({ 
+    dsn: 'https://[email protected]/1366275',
+    integrations: [
+        // Enable HTTP calls tracing
+        new Sentry.Integrations.Http({ tracing: true }),
+        // Enable Express.js middleware tracing
+        new Tracing.Integrations.Express({ app }),
+    ],
+
+    // Sample rate can be set as a decimal between 0 and 1
+    // representing the percent of transactions to record
+    //
+    // For our example, we will collect all transactions
+    tracesSampleRate: 1.0,
+});
 
 let Inventory = {
     wrench: 0,
@@ -30,6 +46,8 @@ let checkout = (cart) => {
 
 // The request handler must be the first middleware on the app
 app.use(Sentry.Handlers.requestHandler());
+// TracingHandler creates a trace for every incoming request
+app.use(Sentry.Handlers.tracingHandler());
 
 app.use(bodyParser.json());
 app.use(cors());
@@ -69,8 +87,11 @@ app.post('/checkout', function (req, res) {
 });
 
 app.get('/capture-message', function (req, res) {
+    // Simulate an API call that takes a random amount
+    // of time and goes long
+    let delay = 2500;
     Sentry.captureMessage('Custom Message');
-    res.send('Success');
+    setTimeout(() => { res.send('Success'); }, delay);    
 });
 
 app.get('/unhandled', function (req, res) {

package.json

@@ -2,8 +2,9 @@
   "name": "t-em-backend",
   "version": "1.0.0",
   "dependencies": {
-    "@sentry/node": "^5.2",
     "@sentry/cli": "^1.37.0",
+    "@sentry/node": "^5.27.4",
+    "@sentry/tracing": "^5.27.4",
     "body-parser": "^1.19.0",
     "cors": "^2.8.5",
     "express": "^4.17.1"