Langfuse v4.39.0
Langfuse releases published Langfuse v4.39.0. What's Changed Features feat(web): publish event-loop delay for autoscaling by @sumerman in 17632 feat(automations): filter prompt events by label by @tobi12345 in 17612 feat(ai-gateway): add phase spans so request traces have no gaps by @hassiebp in 17640 feat(ai-gateway): record Codex client metadata as agent…
Why this signal matters
Langfuse releases published Langfuse v4.39.0. This release-watch entry was generated from the project's official GitHub release feed and is kept separate from human-reviewed editorial analysis. Release notes: What's Changed Features feat(web): publish event-loop delay for autoscaling by @sumerman in 17632 feat(automations): filter prompt events by label by @tobi12345 in 17612 feat(ai-gateway): add phase spans so request traces have no gaps by @hassiebp in 17640 feat(ai-gateway): record Codex client metadata as agent metadata by @hassiebp in 17641 feat(auth): authorize every ingestion event through the policy core by @marksalpeter in 16715 feat(otel): simulate worker admission in shadow mode by @sumerman in 17437 feat: return conversation history and current turn per thread by @marliessophie in 17613 feat(langchain): add serialized generation result fixture for LangChain messages normalization by @marliessophie in 17589 feat(in-app-agent): support Vertex AI for instance AI features by @toyayuto in 17390 feat(api): route prompt public handlers through the auth seam by @marksalpeter in 17533…
Actionable summary
Treat Langfuse v4.39.0 as an official release signal. Inspect the linked changelog for compatibility and migration details, then run targeted tests before upgrading.
- Agent usefulness
- 82/100
- Confidence
- 96%
- Canonical data
- JSON + Markdown
What builders should check
- Review the official Langfuse releases release notes before upgrading.
- Check compatibility, migration, and security notes against your current agent stack.
- Run focused regression tests before production rollout.