monuments_without_id.py outputs reports on any monument image which dies not have a Commons tracking template.
It outputs all such images into one gallery. For a large dataset where the script had not been run in a while the galleries can become large enough to slow down/crash the page.
Implement a max_images feature, similar to that in unused images to prevent the gallery from becoming too large.
The edit summary can clarify that there are more non-reported candidates.