What's Changed

• fix(message-placeholders): use plain text langchain format for placeh… by @nimarb in #616
• chore: add test for observation error level through langchain integration by @nimarb in #637
• feat(api): update API spec from langfuse/langfuse 0b68c41 by @langfuse-bot in #640
• fix(openai): parse response usage by @hassiebp in #641

New Contributors

• @langfuse-bot made their first contribution in #640

Full Changelog: v4.1.0...v4.2.0