When placing holds for clubs, there is currently no alert letting staff know that a patron/s did not get the item placed on hold for them. If a patron already has too many holds, then this club level hold does not get placed, and the staff does not get alerted that a hold was not placed for the patron.
Bug 29115 should alleviate this problem a tiny bit but I think we would have to get the answer after placing the request how many succeeded as the situation might change after the hold request page load.
Bug 29115 adds a note to the process if the patron's account is expired or if they have debits beyond the maxoutstanding system preference. That's a start, but it would also be helpful to know when a hold isn't placed because the circ rules don't allow it (either because that library/item/patron combination doesn't allow holds at all or because the hold would exceed the allowed hold count).