LangSmith, a unified developer platform for LLM application observability and evaluation, has been made Generally Available by LangChain. The platform focuses on two primary challenges users encounter when developing LLM applications: Observability and Evaluation. LangSmith uses ClickHouse as the database to power user experience and ClickHouse Cloud as the service behind their hosted offering. The decision to use ClickHouse was driven by its ability to handle high insert workloads, low latency analytical queries, and its compatibility with all deployment models.