If a ticket is opened and has time tracked on it but nothing is submitted, then that ticket is unattended. An agent receives Unattended Tickets point for opening and closing the ticket without actually doing any work on that ticket.
Agent opens ticket #123
Agent closes ticket #123 (1 Unattended Tickets point rewarded)
NOTE: In the event the agent were to come back to ticket #123 within the same day that the Unassigned point was awarded and do work on that ticket (such as send a public comment) then the Unattended point would be removed.
The Unattended Metric is useful to help agents that may be cherry picking tickets. I.e., Opening a ticket and looking at it but taking no actual action such as submitting a comment, assigning the ticket, or changing the status.