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

- 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

app/api/chat/route.ts

@@ -30,7 +30,16 @@ function createCachedStreamResponse(xml: string): Response {
 
 export async function POST(req: Request) {
   try {
-    const { messages, xml } = await req.json();
+    const { messages, xml, sessionId } = await req.json();
+
+    // Get user IP for Langfuse tracking
+    const forwardedFor = req.headers.get('x-forwarded-for');
+    const userId = forwardedFor?.split(',')[0]?.trim() || 'anonymous';
+
+    // Validate sessionId for Langfuse (must be string, max 200 chars)
+    const validSessionId = sessionId && typeof sessionId === 'string' && sessionId.length <= 200
+      ? sessionId
+      : undefined;
 
     // === CACHE CHECK START ===
     const isFirstMessage = messages.length === 1;
@@ -257,6 +266,16 @@ ${lastMessageText}
       messages: [systemMessageWithCache, ...enhancedMessages],
       ...(providerOptions && { providerOptions }),
       ...(headers && { headers }),
+      // Only enable telemetry if Langfuse is configured
+      ...(process.env.LANGFUSE_PUBLIC_KEY && {
+        experimental_telemetry: {
+          isEnabled: true,
+          metadata: {
+            sessionId: validSessionId,
+            userId: userId,
+          },
+        },
+      }),
       onFinish: ({ usage, providerMetadata }) => {
         console.log('[Cache] Usage:', JSON.stringify({
           inputTokens: usage?.inputTokens,

components/chat-panel.tsx

@@ -61,6 +61,9 @@ export default function ChatPanel({
     const [showHistory, setShowHistory] = useState(false);
     const [input, setInput] = useState("");
 
+    // Generate a unique session ID for Langfuse tracing
+    const [sessionId, setSessionId] = useState(() => `session-${Date.now()}-${Math.random().toString(36).slice(2, 9)}`);
+
     const { messages, sendMessage, addToolResult, status, error, setMessages } =
         useChat({
             transport: new DefaultChatTransport({
@@ -177,6 +180,7 @@ Please retry with an adjusted search pattern or use display_diagram if retries a
                     {
                         body: {
                             xml: chartXml,
+                            sessionId,
                         },
                     }
                 );
@@ -293,6 +297,7 @@ Please retry with an adjusted search pattern or use display_diagram if retries a
                     onClearChat={() => {
                         setMessages([]);
                         clearDiagram();
+                        setSessionId(`session-${Date.now()}-${Math.random().toString(36).slice(2, 9)}`);
                     }}
                     files={files}
                     onFileChange={handleFileChange}

env.example

@@ -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

instrumentation.ts

@@ -0,0 +1,22 @@
+import { LangfuseSpanProcessor } from '@langfuse/otel';
+import { NodeTracerProvider } from '@opentelemetry/sdk-trace-node';
+
+export function register() {
+  // Skip telemetry if Langfuse env vars are not configured
+  if (!process.env.LANGFUSE_PUBLIC_KEY || !process.env.LANGFUSE_SECRET_KEY) {
+    console.warn('[Langfuse] Environment variables not configured - telemetry disabled');
+    return;
+  }
+
+  const langfuseSpanProcessor = new LangfuseSpanProcessor({
+    publicKey: process.env.LANGFUSE_PUBLIC_KEY,
+    secretKey: process.env.LANGFUSE_SECRET_KEY,
+    baseUrl: process.env.LANGFUSE_BASEURL,
+  });
+
+  const tracerProvider = new NodeTracerProvider({
+    spanProcessors: [langfuseSpanProcessor],
+  });
+
+  tracerProvider.register();
+}

package-lock.json

@@ -15,8 +15,10 @@
                 "@ai-sdk/google": "^2.0.0",
                 "@ai-sdk/openai": "^2.0.19",
                 "@ai-sdk/react": "^2.0.22",
+                "@langfuse/otel": "^4.4.4",
                 "@next/third-parties": "^16.0.6",
                 "@openrouter/ai-sdk-provider": "^1.2.3",
+                "@opentelemetry/sdk-trace-node": "^2.2.0",
                 "@radix-ui/react-dialog": "^1.1.6",
                 "@radix-ui/react-scroll-area": "^1.2.3",
                 "@radix-ui/react-slot": "^1.1.2",
@@ -1592,6 +1594,33 @@
                 "@jridgewell/sourcemap-codec": "^1.4.14"
             }
         },
+        "node_modules/@langfuse/core": {
+            "version": "4.4.4",
+            "resolved": "https://registry.npmjs.org/@langfuse/core/-/core-4.4.4.tgz",
+            "integrity": "sha512-hmtMNAOIsvDwT/xld0CJPXrIsakETbelSmAOGEY07faKtKdJy/BGjxexBbfAWLPgAC6wqC2fK2ByaYCGgC7MBw==",
+            "license": "MIT",
+            "peerDependencies": {
+                "@opentelemetry/api": "^1.9.0"
+            }
+        },
+        "node_modules/@langfuse/otel": {
+            "version": "4.4.4",
+            "resolved": "https://registry.npmjs.org/@langfuse/otel/-/otel-4.4.4.tgz",
+            "integrity": "sha512-b6VfVZUf5U1HrbPicUNZ0jYuR2QmnGhJpOV85Kbonzkslu60XggzjKi1UzTAVCA0sVzABK7WvqWvojpk02bfAw==",
+            "license": "MIT",
+            "dependencies": {
+                "@langfuse/core": "^4.4.4"
+            },
+            "engines": {
+                "node": ">=20"
+            },
+            "peerDependencies": {
+                "@opentelemetry/api": "^1.9.0",
+                "@opentelemetry/core": "^2.0.1",
+                "@opentelemetry/exporter-trace-otlp-http": ">=0.202.0 <1.0.0",
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         "node_modules/@napi-rs/wasm-runtime": {
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@@ -1860,6 +1889,273 @@
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             }
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+            "peer": true,
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+            }
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+        "node_modules/@opentelemetry/context-async-hooks": {
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         "node_modules/@radix-ui/number": {
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@@ -2780,7 +3076,6 @@
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-            "dev": true,
             "license": "MIT",
             "dependencies": {
                 "undici-types": "~6.19.2"
@@ -6505,6 +6800,13 @@
             "dev": true,
             "license": "MIT"
         },
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+            "peer": true
+        },
         "node_modules/longest-streak": {
             "version": "3.1.0",
             "resolved": "https://registry.npmjs.org/longest-streak/-/longest-streak-3.1.0.tgz",
@@ -7899,6 +8201,31 @@
                 "react-is": "^16.13.1"
             }
         },
+        "node_modules/protobufjs": {
+            "version": "7.5.4",
+            "resolved": "https://registry.npmjs.org/protobufjs/-/protobufjs-7.5.4.tgz",
+            "integrity": "sha512-CvexbZtbov6jW2eXAvLukXjXUW1TzFaivC46BpWc/3BpcCysb5Vffu+B3XHMm8lVEuy2Mm4XGex8hBSg1yapPg==",
+            "hasInstallScript": true,
+            "license": "BSD-3-Clause",
+            "peer": true,
+            "dependencies": {
+                "@protobufjs/aspromise": "^1.1.2",
+                "@protobufjs/base64": "^1.1.2",
+                "@protobufjs/codegen": "^2.0.4",
+                "@protobufjs/eventemitter": "^1.1.0",
+                "@protobufjs/fetch": "^1.1.0",
+                "@protobufjs/float": "^1.0.2",
+                "@protobufjs/inquire": "^1.1.0",
+                "@protobufjs/path": "^1.1.2",
+                "@protobufjs/pool": "^1.1.0",
+                "@protobufjs/utf8": "^1.1.0",
+                "@types/node": ">=13.7.0",
+                "long": "^5.0.0"
+            },
+            "engines": {
+                "node": ">=12.0.0"
+            }
+        },
         "node_modules/punycode": {
             "version": "2.3.1",
             "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
@@ -9114,7 +9441,6 @@
             "version": "6.19.8",
             "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.19.8.tgz",
             "integrity": "sha512-ve2KP6f/JnbPBFyobGHuerC9g1FYGn/F8n1LWTwNxCEzd6IfqTwUQcNXgEtmmQ6DlRrC1hrSrBnCZPokRrDHjw==",
-            "dev": true,
             "license": "MIT"
         },
         "node_modules/unified": {

package.json

@@ -16,8 +16,10 @@
         "@ai-sdk/google": "^2.0.0",
         "@ai-sdk/openai": "^2.0.19",
         "@ai-sdk/react": "^2.0.22",
+        "@langfuse/otel": "^4.4.4",
         "@next/third-parties": "^16.0.6",
         "@openrouter/ai-sdk-provider": "^1.2.3",
+        "@opentelemetry/sdk-trace-node": "^2.2.0",
         "@radix-ui/react-dialog": "^1.1.6",
         "@radix-ui/react-scroll-area": "^1.2.3",
         "@radix-ui/react-slot": "^1.1.2",