Gets or sets a value indicating whether to always log to the same file.
true if always should be logged to the same file, otherwise
By default file.log is always the current file. Optionally file.log.yyyy-mm-dd for current formatted datePattern can by the currently logging file (or file.log.curSizeRollBackup or even file.log.yyyy-mm-dd.curSizeRollBackup).
This will make time based rollovers with a large number of backups much faster as the appender it won't have to rename all the backups!