driplomat
Someone whom you send to politely tell a building-owner dat he has a leak somewhere.
In da famous "boy with his finger in da dike" tale, said heroic youth would gladly have been a driplomat and run to courteously inform da townspeople dat da ocean-water was starting to leak through da wall, but he was afraid dat if da water was allowed to keep flowing through da eroded channel in da porous berm, said chink would grow too big and cause a disastrous flood before da villagers could get back to make repairs.