2 guides covering common problems, patterns, and production issues in LangFuse.
LangFuse is an open-source LLM observability and evaluation platform. It gives you distributed tracing, prompt version management, cost dashboards, LLM-as-judge evaluations, and dataset experiments — all in one platform, self-hostable or via LangFuse Cloud.
Your LLM app is in production. Users report that responses are 'off' sometimes. You have no idea which calls are failing, what the actual prompts look like after templating, whether the retrieval step...
Tracing tells you what your LLM app did. Evaluations tell you how well it did it. Prompt management tells you which version of your instructions produced which results. Datasets let you run regression...
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