As for any alarms being raised, I don't' think that any of them were able to do that because as I came across the drums I destroyed them.
I can't confirm that it hasn't been changed in a patch, but it used to be that even if you broke the drums, a goblin would still go pound the empty air and set off an alarm. Most of these fights have a "squirter" that goes for the drum and must be stopped.
