Yep, isitmaintained.com uses issue resolution time and open percentage of issues...

		ripexz on Nov 13, 2017 \| parent \| context \| favorite \| on: Ask HN: How much time do you spend on “marketing” ... Yep, isitmaintained.com uses issue resolution time and open percentage of issues/PRs as the metrics: http://isitmaintained.com/project/pubkey/rxdb :)