From OpenStreetMap Wiki
|This tag page does not have a proposal (what's this?)|
|ale_supply = limited|
|Used to identify pubs/bars and suitability for serving large numbers of geobeers|
|Used on these elements|
|Status: in use|
|Tools for this tag|
Used in conjunction with real_ale=yes when the amenity=pub or amenity=bar proved incapable of meeting demand for geobeers during OSM Hack events or other geo events. In this case the recognised tag is ale_supply=limited.