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LogFilename and dirPath Substitution for Aging
Example: aging a log file day by day and rotate by a month
Example: make log directory hierarchical by date
The latest LOGFILE will be pointed with another file name (hard link to it) which name is made by omitting "[date+format]" parts from LOGFILE specification. For example, by the LOGFILE specification in the above example, logfile will be named like "log/aged/00/12/31/80.http" while the latest one is given another name "log/80.http".
Another pattern for aging is "[start+format]" which will be evaluated in the same way with "date+" except that it will be substituted by the time when the DeleGate started (or restarted by SIGHUP or specified TIMEOUT=restart).