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feat: add optional Langfuse observability integration

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- 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
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dayuan.jiang
2025-12-04 00:13:42 +09:00
parent d84edb529c
commit 30b598d960
6 changed files with 265 additions and 138 deletions
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env.example
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@@ -41,3 +41,9 @@ AI_MODEL=global.anthropic.claude-sonnet-4-5-20250929-v1:0
# DeepSeek Configuration
# DEEPSEEK_API_KEY=sk-...
# DEEPSEEK_BASE_URL=https://api.deepseek.com/v1 # Optional: Custom endpoint
# Langfuse Observability (Optional)
# Enable LLM tracing and analytics - https://langfuse.com
# LANGFUSE_PUBLIC_KEY=pk-lf-...
# LANGFUSE_SECRET_KEY=sk-lf-...
# LANGFUSE_BASEURL=https://cloud.langfuse.com # EU region, use https://us.cloud.langfuse.com for US