Boots the rubber seals that are around the electric service and plumbing vent pipes air vents and exhaust fan.
Roof lantern leaking.
Ridge cap flashing gaskets around pipes.
Had an extension built last year with one of these on the roof.
In the victorian era metal framed roof lanterns became popular in building design and were used to highlight stairwells.
A year has now passed and during the very heavy rain at the weekend a few drops came through from where the central ridge joins the supports.
These normally have a foam bung stuck to the glass as they have a sticky backing.
Start low soaking the area just above where the leak appears in the house.
You may be getting a leak from these if they are missing.
The hub is half a moon shape where the end roof rafters fix to.
Assuming that roof lanterns are fitted on flat roofs.
Remember the old saying.
Post renaissance roof lanterns were typically made from timber and glass and many structures were prone to leaking.
Nothing serious but obviously a concern.
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There are 2 sorts of flat roof those that leak and those that will leak.
For example soak the downhill side of a chimney first then each side then the top on both sides.
Isolate areas when you run the hose.