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chore: add Apache 2.0 license and update gitignore (#68)

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* feat: integrate Langfuse for LLM observability

- Add instrumentation.ts with Langfuse OpenTelemetry exporter
- Enable experimental telemetry on streamText calls
- Add instrumentationHook to Next.js config
- Install required dependencies (@vercel/otel, langfuse-vercel, etc.)

* feat: add optional Langfuse observability integration

- Add session tracking with unique sessionId per conversation
- Add user tracking via IP address (x-forwarded-for header)
- Make telemetry conditional - only enabled if LANGFUSE_PUBLIC_KEY is set
- Add environment variable validation in instrumentation.ts
- Add sessionId validation (type check + 200 char limit)
- Update env.example with Langfuse configuration docs
- Remove unused langfuse-vercel and @vercel/otel packages

* fix: remove deprecated instrumentationHook (enabled by default in Next.js 15)

* chore: add Apache 2.0 license and update gitignore
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Dayuan Jiang
2025-12-04 00:33:32 +09:00
committed by GitHub
parent fa1b02ad78
commit bed04c82f8
3 changed files with 192 additions and 0 deletions
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@@ -41,3 +41,4 @@ yarn-error.log*
next-env.d.ts
push-via-ec2.sh
.claude/settings.local.json
.playwright-mcp/