I haven't used anything else, but I'll gladly shill for https://honeycomb.io.

I think we fit in that bucket [1] - open source, self-hostable, based on OpenTelemetry and backed by Clickhouse DB (columnar, not time-series).

Clickhouse gives users much greater flexibility in tradeoffs than either a time-series or inverted-index based store could offer (along with S3 support). There's nothing like a system that can balance high performance AND (usable) high cardinality.

[1] https://github.com/hyperdxio/hyperdx

disclaimer (in case anyone just skimmed): I'm one of the authors of HyperDX

Companies like https://signoz.io/ are Opentelemetry native and have very transparent approach to predictable pricing. You can self host easily as well.