LevelsFromStr parses a string of the form "name1=DEBUG;prefix*=WARN;*=ERROR" into a slice of NamedLevel it may be useful to parse the log level from the OS env var.

SetDefault replaces the default logger you need to call SetNamedLevels after in case you have named loggers, otherwise they will use the old logger.

SetNamedLevels sets the namedLevels for named loggers it also supports glob patterns for names, like "app*" can be racy in case there are existing named loggers so consider to call only once at the beginning.