I've been happy with OpenObserve for personal use. It's a minimal deployment, so I'm not sure how well it scales, but I really like that it's self-contained, easy to deploy and manage. Not having to think about integrating a half-dozen different tools is great. I just setup otel-collector on each node, and point them to the OpenObserve host. Easy.

I've been doing monitoring since before it was called observability with good old Nagios, and the modern observability stack is insane. I'm glad that tools like OpenObserve and SigNoz exist.