I've followed https://github.com/Yelp/elastalert which was archived and then forked by https://github.com/jertel/elastalert2 for quite a while, and I'm pretty ambiguous about it. On one hand, it looks like these projects got some good traction, but on the other hand, they feel pretty abandoned these days. I've also tried to reach out to the maintainers and am still waiting for an answer.
Anyway - if you use any of these projects, I'll be more than happy to talk (just drop a comment or send an email to shahar@keephq.dev)
The context is, I'm building Keep (https://github.com/keephq/keep), and I thought these projects could work pretty cool together. So, I'm trying to understand if they are still being used.
The Grafana based stack is gaining popularity too (with loki)