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fix: filter Langfuse traces to only export chat and AI SDK spans (#392)

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Switch from blocklist to whitelist approach - only export spans named
'chat' or starting with 'ai.' to filter out Next.js infrastructure noise
(HEAD, fetch, POST requests).
This commit is contained in:
Dayuan Jiang
2025-12-24 10:47:34 +09:00
committed by GitHub
parent 82f4deb23a
commit 63398d9f34
1 changed files with 5 additions and 13 deletions
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18
instrumentation.ts
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@@ -14,22 +14,14 @@ export function register() {
publicKey: process.env.LANGFUSE_PUBLIC_KEY,
secretKey: process.env.LANGFUSE_SECRET_KEY,
baseUrl: process.env.LANGFUSE_BASEURL,
// Filter out Next.js HTTP request spans so AI SDK spans become root traces
// Whitelist approach: only export AI-related spans
shouldExportSpan: ({ otelSpan }) => {
const spanName = otelSpan.name
// Skip Next.js HTTP infrastructure spans
if (
spanName.startsWith("POST") ||
spanName.startsWith("GET") ||
spanName.startsWith("RSC") ||
spanName.includes("BaseServer") ||
spanName.includes("handleRequest") ||
spanName.includes("resolve page") ||
spanName.includes("start response")
) {
return false
}
// Only export AI SDK spans (ai.*) and our explicit "chat" wrapper
if (spanName === "chat" || spanName.startsWith("ai.")) {
return true
}
return false
},
})