From 87cdc53665f6a92d5910f17b44122dc9aec28084 Mon Sep 17 00:00:00 2001
From: Dayuan Jiang <34411969+DayuanJiang@users.noreply.github.com>
Date: Tue, 23 Dec 2025 09:47:23 +0900
Subject: [PATCH] fix: improve Langfuse span filter to exclude all Next.js
 infrastructure traces (#365)

* debug: add log to verify instrumentation initialization

* fix: improve Langfuse span filter to exclude all Next.js infrastructure traces
---
 instrumentation.ts | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/instrumentation.ts b/instrumentation.ts
index abd8c14..7fe59fb 100644
--- a/instrumentation.ts
+++ b/instrumentation.ts
@@ -19,10 +19,13 @@ export function register() {
             const spanName = otelSpan.name
             // Skip Next.js HTTP infrastructure spans
             if (
-                spanName.startsWith("POST /") ||
-                spanName.startsWith("GET /") ||
+                spanName.startsWith("POST") ||
+                spanName.startsWith("GET") ||
+                spanName.startsWith("RSC") ||
                 spanName.includes("BaseServer") ||
-                spanName.includes("handleRequest")
+                spanName.includes("handleRequest") ||
+                spanName.includes("resolve page") ||
+                spanName.includes("start response")
             ) {
                 return false
             }
@@ -36,4 +39,5 @@ export function register() {
 
     // Register globally so AI SDK's telemetry also uses this processor
     tracerProvider.register()
+    console.log("[Langfuse] Instrumentation initialized successfully")
 }