Create a LogGroupRule. Basically you define what logger name(s) match for this group, what level should be used what logger type (where to log) and what format to write in. If the loggerType is custom, then the callBackLogger must be supplied as callback function to return a custom logger.
Regular expression, what matches for your logger names for this group
LogLevel
LogFormat
Type of logger, if Custom, make sure to implement callBackLogger and pass in, this will be called so you can return your own logger.
Callback function to return a new clean custom logger (yours!)
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Defines a LogGroupRule, this allows you to either have everything configured the same way or for example loggers that start with name model. It allows you to group loggers together to have a certain loglevel and other settings. You can configure this when creating the LoggerFactory (which accepts multiple LogGroupRules).