fix(nextjs): Set span source to url for middlewares

dev-packages/e2e-tests/test-applications/nextjs-app-dir/tests/middleware.test.ts

@@ -14,6 +14,7 @@ test('Should create a transaction for middleware', async ({ request }) => {
   expect(middlewareTransaction.contexts?.trace?.status).toBe('ok');
   expect(middlewareTransaction.contexts?.trace?.op).toBe('http.server.middleware');
   expect(middlewareTransaction.contexts?.runtime?.name).toBe('vercel-edge');
+  expect(middlewareTransaction.transaction_info?.source).toBe('url');
 
   // Assert that isolation scope works properly
   expect(middlewareTransaction.tags?.['my-isolated-tag']).toBe(true);
@@ -38,6 +39,7 @@ test('Faulty middlewares', async ({ request }) => {
     expect(middlewareTransaction.contexts?.trace?.status).toBe('unknown_error');
     expect(middlewareTransaction.contexts?.trace?.op).toBe('http.server.middleware');
     expect(middlewareTransaction.contexts?.runtime?.name).toBe('vercel-edge');
+    expect(middlewareTransaction.transaction_info?.source).toBe('url');
   });
 
   await test.step('should record exceptions', async () => {

packages/nextjs/src/common/wrapMiddlewareWithSentry.ts

@@ -32,17 +32,17 @@ export function wrapMiddlewareWithSentry<H extends EdgeRouteHandler>(
         const currentScope = getCurrentScope();
 
         let spanName: string;
-        let spanOrigin: TransactionSource;
+        let spanSource: TransactionSource;
 
         if (req instanceof Request) {
           isolationScope.setSDKProcessingMetadata({
             request: winterCGRequestToRequestData(req),
           });
           spanName = `middleware ${req.method} ${new URL(req.url).pathname}`;
-          spanOrigin = 'url';
+          spanSource = 'url';
         } else {
           spanName = 'middleware';
-          spanOrigin = 'component';
+          spanSource = 'component';
         }
 
         currentScope.setTransactionName(spanName);
@@ -53,7 +53,7 @@ export function wrapMiddlewareWithSentry<H extends EdgeRouteHandler>(
           // If there is an active span, it likely means that the automatic Next.js OTEL instrumentation worked and we can
           // rely on that for parameterization.
           spanName = 'middleware';
-          spanOrigin = 'component';
+          spanSource = 'component';
 
           const rootSpan = getRootSpan(activeSpan);
           if (rootSpan) {
@@ -66,7 +66,7 @@ export function wrapMiddlewareWithSentry<H extends EdgeRouteHandler>(
             name: spanName,
             op: 'http.server.middleware',
             attributes: {
-              [SEMANTIC_ATTRIBUTE_SENTRY_SOURCE]: spanOrigin,
+              [SEMANTIC_ATTRIBUTE_SENTRY_SOURCE]: spanSource,
               [SEMANTIC_ATTRIBUTE_SENTRY_ORIGIN]: 'auto.function.nextjs.wrapMiddlewareWithSentry',
             },
           },

packages/nextjs/src/edge/index.ts

@@ -1,5 +1,7 @@
 import {
   SEMANTIC_ATTRIBUTE_SENTRY_OP,
+  SEMANTIC_ATTRIBUTE_SENTRY_ORIGIN,
+  SEMANTIC_ATTRIBUTE_SENTRY_SOURCE,
   applySdkMetadata,
   getRootSpan,
   registerSpanErrorInstrumentation,
@@ -52,9 +54,15 @@ export function init(options: VercelEdgeOptions = {}): void {
   client?.on('spanStart', span => {
     const spanAttributes = spanToJSON(span).data;
 
+    // Mark all spans generated by Next.js as 'auto'
+    if (spanAttributes?.['next.span_type'] !== undefined) {
+      span.setAttribute(SEMANTIC_ATTRIBUTE_SENTRY_ORIGIN, 'auto');
+    }
+
     // Make sure middleware spans get the right op
     if (spanAttributes?.['next.span_type'] === 'Middleware.execute') {
       span.setAttribute(SEMANTIC_ATTRIBUTE_SENTRY_OP, 'http.server.middleware');
+      span.setAttribute(SEMANTIC_ATTRIBUTE_SENTRY_SOURCE, 'url');
     }
   });