In cases like these we usually wait to create a new tag until the topic has more traction on this site. Currently there is only one question about HLA at Ask Ubuntu.
I've created several new tags at Ask Ubuntu over the years, many of which had more than 100 questions containing the tag's keyword at the time the tag was created. I also created a tag extract and a tag wiki for each new tag and tagged at least ten questions containing the tag's keyword (preferably in the question's title) with the new tag in order to make the tag easy to understand and hard to delete.