There is already a total count of up- and downvotes, but please never add karma to Lemmy. We don’t want to deal with karma farmers and minimal karma requirements to post. I don’t care about the moderation issues because karma brought more harm than good. Please never add that bloody dreadful thing to Lemmy. I already saw a bunch of people supporting adding karma to Lemmy, which will turn Lemmy into a cheap Reddit clone and karma-farming hell. Please, never add karma to Lemmy. I beg you. No more karma hell.
Kbin already counts upvotes and boosts, similar to reddit karma.
But it could perhaps be something that stays hidden for everyone but yourself and moderators (provided you are participating in their magazine, otherwise anyone could open a magazine to see everyone elses karma)