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

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;
@@ -257,7 +266,16 @@ ${lastMessageText}
       messages: [systemMessageWithCache, ...enhancedMessages],
       ...(providerOptions && { providerOptions }),
       ...(headers && { headers }),
-      experimental_telemetry: { isEnabled: true },
+      // 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

@@ -1,9 +1,22 @@
-import { registerOTel } from '@vercel/otel';
+import { LangfuseSpanProcessor } from '@langfuse/otel';
-import { LangfuseExporter } from 'langfuse-vercel';
+import { NodeTracerProvider } from '@opentelemetry/sdk-trace-node';
 
 export function register() {
-  registerOTel({
+  // Skip telemetry if Langfuse env vars are not configured
-    serviceName: 'next-ai-draw-io',
+  if (!process.env.LANGFUSE_PUBLIC_KEY || !process.env.LANGFUSE_SECRET_KEY) {
-    traceExporter: new LangfuseExporter(),
+    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

@@ -15,24 +15,21 @@
                 "@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/api-logs": "^0.208.0",
+                "@opentelemetry/sdk-trace-node": "^2.2.0",
-                "@opentelemetry/instrumentation": "^0.208.0",
-                "@opentelemetry/sdk-logs": "^0.208.0",
                 "@radix-ui/react-dialog": "^1.1.6",
                 "@radix-ui/react-scroll-area": "^1.2.3",
                 "@radix-ui/react-slot": "^1.1.2",
                 "@radix-ui/react-tooltip": "^1.1.8",
                 "@vercel/analytics": "^1.5.0",
-                "@vercel/otel": "^2.1.0",
                 "@xmldom/xmldom": "^0.9.8",
                 "ai": "^5.0.89",
                 "base-64": "^1.0.0",
                 "class-variance-authority": "^0.7.1",
                 "clsx": "^2.1.1",
                 "jsdom": "^26.0.0",
-                "langfuse-vercel": "^3.38.6",
                 "lucide-react": "^0.483.0",
                 "next": "15.2.3",
                 "ollama-ai-provider-v2": "^1.5.4",
@@ -1597,6 +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",
+                "@opentelemetry/sdk-trace-base": "^2.0.1"
+            }
+        },
         "node_modules/@napi-rs/wasm-runtime": {
             "version": "0.2.12",
             "resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-0.2.12.tgz",
@@ -1870,6 +1894,7 @@
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             "license": "Apache-2.0",
+            "peer": true,
             "dependencies": {
                 "@opentelemetry/api": "^1.3.0"
             },
@@ -1877,6 +1902,18 @@
                 "node": ">=8.0.0"
             }
         },
+        "node_modules/@opentelemetry/context-async-hooks": {
+            "version": "2.2.0",
+            "resolved": "https://registry.npmjs.org/@opentelemetry/context-async-hooks/-/context-async-hooks-2.2.0.tgz",
+            "integrity": "sha512-qRkLWiUEZNAmYapZ7KGS5C4OmBLcP/H2foXeOEaowYCR0wi89fHejrfYfbuLVCMLp/dWZXKvQusdbUEZjERfwQ==",
+            "license": "Apache-2.0",
+            "engines": {
+                "node": "^18.19.0 || >=20.6.0"
+            },
+            "peerDependencies": {
+                "@opentelemetry/api": ">=1.0.0 <1.10.0"
+            }
+        },
         "node_modules/@opentelemetry/core": {
             "version": "2.2.0",
             "resolved": "https://registry.npmjs.org/@opentelemetry/core/-/core-2.2.0.tgz",
@@ -1892,15 +1929,57 @@
                 "@opentelemetry/api": ">=1.0.0 <1.10.0"
             }
         },
-        "node_modules/@opentelemetry/instrumentation": {
+        "node_modules/@opentelemetry/exporter-trace-otlp-http": {
             "version": "0.208.0",
-            "resolved": "https://registry.npmjs.org/@opentelemetry/instrumentation/-/instrumentation-0.208.0.tgz",
+            "resolved": "https://registry.npmjs.org/@opentelemetry/exporter-trace-otlp-http/-/exporter-trace-otlp-http-0.208.0.tgz",
-            "integrity": "sha512-Eju0L4qWcQS+oXxi6pgh7zvE2byogAkcsVv0OjHF/97iOz1N/aKE6etSGowYkie+YA1uo6DNwdSxaaNnLvcRlA==",
+            "integrity": "sha512-jbzDw1q+BkwKFq9yxhjAJ9rjKldbt5AgIy1gmEIJjEV/WRxQ3B6HcLVkwbjJ3RcMif86BDNKR846KJ0tY0aOJA==",
             "license": "Apache-2.0",
+            "peer": true,
+            "dependencies": {
+                "@opentelemetry/core": "2.2.0",
+                "@opentelemetry/otlp-exporter-base": "0.208.0",
+                "@opentelemetry/otlp-transformer": "0.208.0",
+                "@opentelemetry/resources": "2.2.0",
+                "@opentelemetry/sdk-trace-base": "2.2.0"
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+        "node_modules/@opentelemetry/otlp-exporter-base": {
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+        "node_modules/@opentelemetry/otlp-transformer": {
+            "version": "0.208.0",
+            "resolved": "https://registry.npmjs.org/@opentelemetry/otlp-transformer/-/otlp-transformer-0.208.0.tgz",
+            "integrity": "sha512-DCFPY8C6lAQHUNkzcNT9R+qYExvsk6C5Bto2pbNxgicpcSWbe2WHShLxkOxIdNcBiYPdVHv/e7vH7K6TI+C+fQ==",
+            "license": "Apache-2.0",
+            "peer": true,
             "dependencies": {
                 "@opentelemetry/api-logs": "0.208.0",
-                "import-in-the-middle": "^2.0.0",
+                "@opentelemetry/core": "2.2.0",
-                "require-in-the-middle": "^8.0.0"
+                "@opentelemetry/resources": "2.2.0",
+                "@opentelemetry/sdk-logs": "0.208.0",
+                "@opentelemetry/sdk-metrics": "2.2.0",
+                "@opentelemetry/sdk-trace-base": "2.2.0",
+                "protobufjs": "^7.3.0"
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@@ -1930,6 +2009,7 @@
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             "license": "Apache-2.0",
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@@ -1964,7 +2044,6 @@
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@@ -1977,6 +2056,23 @@
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             }
         },
+        "node_modules/@opentelemetry/sdk-trace-node": {
+            "version": "2.2.0",
+            "resolved": "https://registry.npmjs.org/@opentelemetry/sdk-trace-node/-/sdk-trace-node-2.2.0.tgz",
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+            "license": "Apache-2.0",
+            "dependencies": {
+                "@opentelemetry/context-async-hooks": "2.2.0",
+                "@opentelemetry/core": "2.2.0",
+                "@opentelemetry/sdk-trace-base": "2.2.0"
+            },
+            "engines": {
+                "node": "^18.19.0 || >=20.6.0"
+            },
+            "peerDependencies": {
+                "@opentelemetry/api": ">=1.0.0 <1.10.0"
+            }
+        },
         "node_modules/@opentelemetry/semantic-conventions": {
             "version": "1.38.0",
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@@ -1986,6 +2082,80 @@
                 "node": ">=14"
             }
         },
+        "node_modules/@protobufjs/aspromise": {
+            "version": "1.1.2",
+            "resolved": "https://registry.npmjs.org/@protobufjs/aspromise/-/aspromise-1.1.2.tgz",
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+            "license": "BSD-3-Clause",
+            "peer": true
+        },
+        "node_modules/@protobufjs/base64": {
+            "version": "1.1.2",
+            "resolved": "https://registry.npmjs.org/@protobufjs/base64/-/base64-1.1.2.tgz",
+            "integrity": "sha512-AZkcAA5vnN/v4PDqKyMR5lx7hZttPDgClv83E//FMNhR2TMcLUhfRUBHCmSl0oi9zMgDDqRUJkSxO3wm85+XLg==",
+            "license": "BSD-3-Clause",
+            "peer": true
+        },
+        "node_modules/@protobufjs/codegen": {
+            "version": "2.0.4",
+            "resolved": "https://registry.npmjs.org/@protobufjs/codegen/-/codegen-2.0.4.tgz",
+            "integrity": "sha512-YyFaikqM5sH0ziFZCN3xDC7zeGaB/d0IUb9CATugHWbd1FRFwWwt4ld4OYMPWu5a3Xe01mGAULCdqhMlPl29Jg==",
+            "license": "BSD-3-Clause",
+            "peer": true
+        },
+        "node_modules/@protobufjs/eventemitter": {
+            "version": "1.1.0",
+            "resolved": "https://registry.npmjs.org/@protobufjs/eventemitter/-/eventemitter-1.1.0.tgz",
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+            }
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+            "license": "BSD-3-Clause",
+            "peer": true
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+        "node_modules/@protobufjs/pool": {
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+            "license": "BSD-3-Clause",
+            "peer": true
+        },
+        "node_modules/@protobufjs/utf8": {
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+            "resolved": "https://registry.npmjs.org/@protobufjs/utf8/-/utf8-1.1.0.tgz",
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+            "peer": true
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         "node_modules/@radix-ui/number": {
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@@ -2906,7 +3076,6 @@
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@@ -3524,24 +3693,6 @@
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@@ -3555,6 +3706,7 @@
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+            "dev": true,
             "license": "MIT",
             "bin": {
                 "acorn": "bin/acorn"
@@ -3563,15 +3715,6 @@
                 "node": ">=0.4.0"
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@@ -7592,27 +7684,12 @@
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@@ -8124,6 +8201,31 @@
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@@ -8362,19 +8464,6 @@
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package.json

@@ -16,24 +16,21 @@
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