Tracing Koa application can be done in two methods:

1. Auto-tracing using the environment variable.
2. Calling the SDK.

Calling the SDK is simple, and should be done in your main js file where the application is being initialized:

const epsagon = require('epsagon-frameworks');

epsagon.init({
  token: 'epsagon-token',
  appName: 'app-name-stage',
  metadataOnly: false,
});

Tagging traces or setting custom errors can be by:

app.use(async ctx => {
  ctx.epsagon.label('key', 'value');
  ctx.epsagon.setError(Error('My custom error'));
});