I’m thinking that a stable library should do a x.x.X release periodically that might go no further than bumping the version number (and maybe fixing typos in the docs) to make it clear it’s not abandoned.
What if the library has been abandoned, but it's cronjob is still perpetually running somewhere on a free cloud server plan? Or even there will appear a cool SaaS which will auto-bump version number every X days with a free plan for open-source GitHub repos?
A counter that count the number of projects that use the library could be useful too. If 20000 projects use it, 300 more since last month. It's clearly alive even if there is no new feature/bug fix since a year.
