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Please Consider that other KGS plugins do log into that file, too.
DR instance logging
TODO Every DocumentRouter has its own log file. This can be configured inside document router instance inside common tab.
Important here are these form fields:
LogDirectory (where the log files will be stored)
LogFilename (how the log file base name is)
Debug (log level 0..4 while 4 means debug and 0 none)
KeepLogfileDays (for log file rotation)
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