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There are these guys which are based on OTEL: https://github.com/hyperdxio/hyperdx

+1 for hyperdx, I'm testing it and love it.

author here, just wanted to chime in that I really appreciate the kind words about what we've been building :)

OSS o11y platform built on clickhouse & otel.

There is lumigo, also based on Clickhouse https://lumigo.io/

I think https://multiplayer.app would also fit your description.