Stale Candidate Queue, one row
Who is still waiting, and the message each one is owed
Sorted by days over, descending. The person waiting longest is the one whose message is hardest to write, and the one most likely to be skipped under any other sort.
Business Days Waiting, Standard, Days Over
Business days from the stage-change date, against that stage's standard. Both choices matter more than the numbers: calendar days make every Friday interview look like a breach by Monday, and measuring from the interview date makes a scheduling delay indistinguishable from a response delay.
Status In ATS
Open, or closed. Closed rows are the backlog: people already marked closed in the system with no message ever logged against them. Open rows are the live leak. Both are in this queue on purpose, because a recruiter reading a queue of open candidates never discovers the closed ones, and the closed ones are usually the bigger group.
Message Owed
Which template applies: close at this stage, hold with a date, advance with a date, or the overdue message. Filling this column is what turns the queue from a list of problems into a batch of drafts.
Blocked On
The diagnostic column. Where it says nothing, the message can go today and all that was missing was somebody looking. Where it names a debrief note or a competing candidate, the honest answer is usually a hold with a date rather than a longer wait.