Debugging is disabled by default. To enable it, you must set the "debug" setting in the config file.
Log files are situated in the contents/extra directory with extension as .log. The log files are written by the Lobby class.
You can add a log entry by calling :
\Lobby::log($message, $filename = "lobby.log");
The default file is "lobby.log". Your app shouldn't call this function, instead it should call :
\Lobby\App::log($message); // $this->log() in App Files
All app's log file is named "apps.log"