This selects the log files to attach to the walk notification. The log files and walk errors are for the period of the refresh walk, and are sent as tab separated files that can be opened with programs such as Excel for further processing.
If the query log is attached it will be cleared after being emailed.
This is an alternative to separate query log rotation and emailing
and is particularly useful when using mode new for rewalks and
you don't want to lose the query log.
See also Rotate Schedule
(section 3.6.5).