Agent Observability: Langfuse, Phoenix, Opik
Three open-source agent observability platforms dominate 2026. Langfuse (MIT) - 6M+ installs/month, tracing + prompt management + evals + session replay. Arize Phoenix (Elastic 2.0) - deep agent-specific evals, RAG relevancy, OpenInference…
On the Agent Systems Engineering career route
Learn this with Professor KatalockOpens in KatalockAi chat: your AI engineering mentor teaches this lesson step by step, checks your understanding and reviews your code.