Log Files Naming Format is used and works best when User Connection Identity is set, to help name the session log file. A String.Format is used with this setting's value as the template. The User Identity is parameter {0}, a DateTime.ShortDate string is {1} and a full DateTime.Now object is parameter {2}. Note that if the format is simply "{0}" then a log file will have ALL logging for ALL TIME for the given User's Identity (each session is appended to the prior session).
A nightly sweep and archive of logs can avoid the log file / folder from becoming too massive...
Examples:
{0}_{1}_{2,-14:HH:mm:ss}
Will create a log file name like: DOMAIN_USER_3_1_2013_15_04_40.log on March 1, 2013 at 3:04:40pm: will log all entries for this session.
{0}_{1}
Will create a log file name like: DOMAIN_USER_3_1_2013.log on March 1, 2013: will log all entries for a given day.
{0} (default)
Will create a log file name like: DOMAIN_USER.log on any day--will log all entries for this user until deleted or moved!