node_span_basics.js

node_span_basics.js

const app = express();

app.get('/hello', (req, res) => {
 // access the span created by express instrumentation
 span = tracer.getCurrentSpan();
  // add an attribute to segment your data by projectID
 span.setAttribute('projectID', '123');
 // log an event and include some structured data.
 span.addEvent('setting timeout', { sleep: 300 });

 setTimeout(()=> {
   span.addEvent(responding after timeout);
   res.status(200).send('Hello World');
 }, 300);
});

app.listen(9000);