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Was also looking at Langfuse.ai or braintrust.dev

Anybody with experience can give me a tip of the best way to - evaluate - manage prompts - trace calls

It's actually langfuse.com! Our quickstart walks you through the whole process: https://docs.confident-ai.com/confident-ai/confident-ai-intr...

Check out agenta.ai it's OSS and provide tools for prompt management, evaluation and observability (with otel). I think it's easy to get started.