For a content management framework as complex as Drupal it's worth logging errors.
- In Raven config, recommend not logging debug and info messages, but do select Enable fatal error handler and Enable stacktraces.
- logs the Drupal uid
- logs referrer URLs
- you can tag versions (e.g. commits) as well as different environments
- you get a full breakdown of AJAX requests
Tested by me
Drupal 8 support