[Changelog] add post for langfuse integration

pages/changelogs/2025-11-04-langfuse-integration.mdx

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+---
+title: "Connect Your LLM Metrics to Mixpanel with Langfuse"
+slug: "changelog-2025-11-04-mixpanel-langfuse-integration"
+hidden: false
+createdAt: "2025-11-0412:00:00.165Z"
+updatedAt: "2025-11-04T12:00:00.165Z"
+date: "2025-11-04"
+thumbnail: "/changelog/mixpanel-langfuse-integration.png"
+description: "We're excited to announce our integration with Langfuse, the open-source LLM engineering platform. Now you can automatically sync your AI application metrics from Langfuse directly into Mixpanel."
+isAnnouncement: true
+---
+
+<ChangelogPostHeader
+  date="2025-11-04"
+  image="/changelog/mixpanel-langfuse-integration.png"
+  title="Connect Your LLM Metrics to Mixpanel with Langfuse"
+/>
+
+We're excited to announce our integration with [Langfuse](https://langfuse.com), the open-source LLM engineering platform. Now you can automatically sync your AI application metrics from Langfuse directly into Mixpanel.
+
+This integration brings three new event types into Mixpanel:
+
+- **`[Langfuse] Trace`** - Complete LLM interactions with cost, latency, and observation counts
+- **`[Langfuse] Generation`** - Individual model calls with token usage and performance metrics
+- **`[Langfuse] Score`** - User feedback and quality evaluations
+
+Answer critical questions about your AI features:
+
+- How do AI interactions impact user retention and conversion?
+- Which users are driving the most LLM costs?
+- Does user feedback on AI outputs correlate with product engagement?
+
+**Set up in minutes:**
+
+1. Add your Mixpanel Project Token in Langfuse project settings
+2. Select your Mixpanel region (US, EU, or India)
+3. Enable the integration
+
+Data syncs automatically every hour with full historical backfill.
+
+[View full documentation →](https://docs.mixpanel.com/docs/tracking-methods/integrations/langfuse)
+
+Install our [Analytics for AI dashboard template](https://mixpanel.com/p/NaKPyubj6EuA4oV75taqrq) to see pre-built reports for adoption, cost analysis, performance metrics, and more.
+
+_Questions? Reach out to [Langfuse support](https://langfuse.com/support) or check the docs for setup details and troubleshooting._