Log4r does feel very robust and customizable, but also feels much more verbose and heavy. You get pretty much all of that and with less verbose configuration w

Log4r does feel very robust and customizable, but also feels much more verbose and heavy. You get pretty much all of that and with less verbose configuration with the Logging gem + lograge, yet they are still relatively easy to tweak. The email notification of the Logging/Logging-rails gem in particular is really great, and you can even define message thresholds (not more than one email per minute, only if X number of errors etc)