[Concepts | 🦜️🛠️ LangSmith](https://docs.smith.langchain.com/observability/concepts): LLM should read this page when configuring an application to log traces to LangSmith, understanding the different data types and concepts used in LangSmith, or planning data storage and retention for traces. The page covers key concepts like Runs, Traces, Projects, Feedback, Tags, and Metadata, and explains data storage, retention, and deletion policies for traces in LangSmith.

