So the basic idea is in Drupal 8 the same Drush utility, site_audit, can be used to figure out all kinds of things how your install is working. We can check for best practices, caching, unused content types, and stats on the database. We can also look at what modules are installed, a security overview, users, views, and Drupal Watchdog entries.
This is a pretty useful module, and much or more of the reporting is likely available for the major Drupal hosting platforms.
It's safe to say than using this module for most any Drupal site is a good idea to profile the site for any issues, performance, or otherwise, virtually an auto-include.