Back when Sourcegraph supported Ruby, I found myself reaching it for all the time. It was slightly half baked (semantic analysis of Ruby is challenging) but still incredibly useful. I look forward to the day Ruby support returns and it being better than ever.
Slightly unrelated, if you're based in the Bay Area, you should go to their meetup. I don't like going to meetups because the content is usually a bit fluffy but they've constantly had strong technical speakers. Here's one with the creator of Raft (https://www.youtube.com/watch?v=2dfSOFqOhOU).