Langfuse - Opensource Google Analytics Alternative for LLM Applications

Langfuse is an open-source observability & analytics solution for LLM-based applications. It is mostly geared towards production usage but some users also use it for local development of their LLM applications.
It's focused on applications built on top of LLMs. Many new abstractions and common best practices evolved recently, e.g. agents, chained prompts, embedding-based retrieval, and LLM access to REPLs & APIs. These make applications more powerful but also unpredictable for developers as they cannot fully anticipate how changes impact the quality, cost, and overall latency of their application. Thus "Langfuse" helps to monitor and debug these applications.
Do check out the project and join the Langfuse community.