This is taken from the Priority Pass website: "Complimentary alcoholic drinks are limited to bottle beer only." I'm not sure how this would be enforced. Honor system, maybe? I'd like to know this as I am now a Priority Pass member and plan on using this lounge again on my next trip.
My wife and I paid to use this lounge in April. We bought the 2 hour pass and lost track of time talking to the bartender. No one came to kick us out or warn us, so they don't seem strict there.