Important messages can be printed to process.stdout or process.stderr, which can be lost if you don't capture that output. The Twelve Factor model suggests using a system facility to capture these output streams. With Notes, we'll use PM2 for that purpose, which we'll cover in Chapter 10, Deploying Node.js Applications.
The logbook module (https://github.com/jpillora/node-logbook) offers some useful capabilities in term of not only capturing process.stdout and process.stderr, but sending that output to useful places.
