I’m not sure if it’s still there but it was part of a Business Lounge in the Schengen area of T2. Business Class passengers on *A carriers, Lufthansa Frequent Flyer (FTL) or above and Star Alliance Gold passengers have access to the lounge. According to reports in this thread it wasn’t anything to get excited about.
First Lufthansa business lounge with beer garden
If you want to visit a beer garden at the airport you should go to Airbräu instead.
https://www.munich-airport.de/en/mic...raeu/index.jsp