Hey Garth, what do you think about using the standard LogInterface levels from PSR-3? Those are listed here:

https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-3-logger-interface.md#5-psrlogloglevel

Personally, since those constants are in the Wikia class, I'd prefer those to be named using a LOG_[LOGLEVEL] scheme as the class context is not making "level" (LVL) straightforward to map to a functionality (adding PHPDoc to each to describe them might also help).