feat(nextjs): Migrate edge event processors to span-first APIs

packages/nextjs/src/edge/enhanceMiddlewareRootSpan.ts

@@ -0,0 +1,41 @@
+import { stripUrlQueryAndFragment } from '@sentry/core';
+import { ATTR_NEXT_SPAN_NAME, ATTR_NEXT_SPAN_TYPE } from '../common/nextSpanAttributes';
+
+export interface MutableMiddlewareRootSpan {
+  attributes: Record<string, unknown>;
+  getName(): string | undefined;
+  setName(name: string): void;
+}
+
+/**
+ * Normalizes the transaction name for the root span of a Next.js `Middleware.execute` request on the Edge runtime.
+ *
+ * Older Next.js versions append the full URL to the middleware span name (e.g. `middleware GET /foo?bar=1`),
+ * producing high-cardinality transaction names. We collapse the name to `middleware {METHOD}` when possible,
+ * and strip query/fragment otherwise.
+ *
+ * Called from two places that operate on different shapes of the same underlying root span:
+ * - Legacy mode: from `preprocessEvent`, adapted around a transaction `Event` whose `contexts.trace.data`
+ *   holds the root span's attributes and whose `event.transaction` is the root span's name.
+ * - Streamed mode: from `processSegmentSpan`, adapted around a `StreamedSpanJSON` (the streamed
+ *   counterpart of the legacy transaction root) directly.
+ */
+export function enhanceMiddlewareRootSpan(span: MutableMiddlewareRootSpan): void {
+  const { attributes } = span;
+
+  if (attributes[ATTR_NEXT_SPAN_TYPE] !== 'Middleware.execute') {
+    return;
+  }
+
+  const spanName = attributes[ATTR_NEXT_SPAN_NAME];
+  if (typeof spanName !== 'string' || !spanName || !span.getName()) {
+    return;
+  }
+
+  const match = spanName.match(/^middleware (GET|POST|PUT|DELETE|PATCH|HEAD|OPTIONS)/);
+  if (match) {
+    span.setName(`middleware ${match[1]}`);
+  } else {
+    span.setName(stripUrlQueryAndFragment(spanName));
+  }
+}

packages/nextjs/src/edge/index.ts

@@ -4,7 +4,6 @@
 import { context } from '@opentelemetry/api';
 import {
   applySdkMetadata,
-  type EventProcessor,
   getCapturedScopesOnSpan,
   getCurrentScope,
   getGlobalScope,
@@ -17,7 +16,6 @@ import {
   SEMANTIC_ATTRIBUTE_SENTRY_SOURCE,
   setCapturedScopesOnSpan,
   spanToJSON,
-  stripUrlQueryAndFragment,
 } from '@sentry/core';
 import { getScopesFromContext } from '@sentry/opentelemetry';
 import type { VercelEdgeOptions } from '@sentry/vercel-edge';
@@ -31,6 +29,7 @@ import { isBuild } from '../common/utils/isBuild';
 import { flushSafelyWithTimeout, isCloudflareWaitUntilAvailable, waitUntil } from '../common/utils/responseEnd';
 import { setUrlProcessingMetadata } from '../common/utils/setUrlProcessingMetadata';
 import { distDirRewriteFramesIntegration } from './distDirRewriteFramesIntegration';
+import { enhanceMiddlewareRootSpan } from './enhanceMiddlewareRootSpan';
 
 export * from '@sentry/vercel-edge';
 export * from '../common';
@@ -85,6 +84,13 @@ export function init(options: VercelEdgeOptions = {}): void {
     ...(isRunningOnCloudflare && { runtime: { name: 'cloudflare' } }),
   };
 
+  const nextjsIgnoreSpans: NonNullable<VercelEdgeOptions['ignoreSpans']> = [
+    // Spans flagged via TRANSACTION_ATTR_SHOULD_DROP_TRANSACTION
+    // (set in `dropMiddlewareTunnelRequests` during `spanStart`)
+    { attributes: { [TRANSACTION_ATTR_SHOULD_DROP_TRANSACTION]: true } },
+  ];
+  opts.ignoreSpans = [...(opts.ignoreSpans || []), ...nextjsIgnoreSpans];
+
   // Use appropriate SDK metadata based on the runtime environment
   if (isRunningOnCloudflare) {
     applySdkMetadata(opts, 'nextjs', ['nextjs', 'cloudflare']);
@@ -137,61 +143,47 @@ export function init(options: VercelEdgeOptions = {}): void {
   // Use the preprocessEvent hook instead of an event processor, so that the users event processors receive the most
   // up-to-date value, but also so that the logic that detects changes to the transaction names to set the source to
   // "custom", doesn't trigger.
+  // This handles the legacy (non-streamed) path where the segment span is emitted as a transaction event;
+  // `enhanceMiddlewareRootSpan` is adapted to operate on the event's trace context, which is the segment span's data.
+  // Span streaming bypasses event processors entirely - see the `processSegmentSpan` hook below for that path.
   client?.on('preprocessEvent', event => {
-    // The otel auto inference will clobber the transaction name because the span has an http.target
-    if (
-      event.type === 'transaction' &&
-      event.contexts?.trace?.data?.['next.span_type'] === 'Middleware.execute' &&
-      event.contexts?.trace?.data?.['next.span_name']
-    ) {
-      if (event.transaction) {
-        // Older nextjs versions pass the full url appended to the middleware name, which results in high cardinality transaction names.
-        // We want to remove the url from the name here.
-        const spanName = event.contexts.trace.data['next.span_name'];
-
-        if (typeof spanName === 'string') {
-          const match = spanName.match(/^middleware (GET|POST|PUT|DELETE|PATCH|HEAD|OPTIONS)/);
-          if (match) {
-            const normalizedName = `middleware ${match[1]}`;
-            event.transaction = normalizedName;
-          } else {
-            event.transaction = stripUrlQueryAndFragment(event.contexts.trace.data['next.span_name']);
-          }
-        }
-      }
+    if (event.type === 'transaction' && event.contexts?.trace?.data) {
+      enhanceMiddlewareRootSpan({
+        attributes: event.contexts.trace.data,
+        getName: () => event.transaction,
+        setName: name => {
+          event.transaction = name;
+        },
+      });
     }
 
     setUrlProcessingMetadata(event);
   });
 
+  // Streamed-span counterpart of the `preprocessEvent` hook above. Streamed segment spans never become
+  // transaction events, so the same enhancement has to be applied here directly on the span JSON.
+  client?.on('processSegmentSpan', span => {
+    const attributes = (span.attributes ??= {});
+    enhanceMiddlewareRootSpan({
+      attributes,
+      getName: () => span.name,
+      setName: name => {
+        span.name = name;
+      },
+    });
+  });
+
   client?.on('spanEnd', span => {
     if (span === getRootSpan(span)) {
       waitUntil(flushSafelyWithTimeout());
     }
   });
 
-  getGlobalScope().addEventProcessor(
-    Object.assign(
-      (event => {
-        // Filter transactions that we explicitly want to drop.
-        if (event.type === 'transaction') {
-          if (event.contexts?.trace?.data?.[TRANSACTION_ATTR_SHOULD_DROP_TRANSACTION]) {
-            return null;
-          }
-
-          return event;
-        } else {
-          return event;
-        }
-      }) satisfies EventProcessor,
-      { id: 'NextLowQualityTransactionsFilter' },
-    ),
-  );
-
   try {
     // @ts-expect-error `process.turbopack` is a magic string that will be replaced by Next.js
     if (process.turbopack) {
       getGlobalScope().setTag('turbopack', true);
+      getGlobalScope().setAttribute('turbopack', true);
     }
   } catch {
     // Noop

packages/nextjs/test/edge/enhanceMiddlewareRootSpan.test.ts

@@ -0,0 +1,110 @@
+import { describe, expect, it } from 'vitest';
+import { ATTR_NEXT_SPAN_NAME, ATTR_NEXT_SPAN_TYPE } from '../../src/common/nextSpanAttributes';
+import { enhanceMiddlewareRootSpan } from '../../src/edge/enhanceMiddlewareRootSpan';
+
+function makeSpan(attributes: Record<string, unknown>, name?: string) {
+  let currentName = name;
+  return {
+    span: {
+      attributes,
+      getName: () => currentName,
+      setName: (n: string) => {
+        currentName = n;
+      },
+    },
+    getName: () => currentName,
+  };
+}
+
+describe('enhanceMiddlewareRootSpan', () => {
+  it('does nothing for spans that are not Middleware.execute', () => {
+    const { span, getName } = makeSpan(
+      { [ATTR_NEXT_SPAN_TYPE]: 'BaseServer.handleRequest', [ATTR_NEXT_SPAN_NAME]: 'middleware GET /foo' },
+      'GET /foo',
+    );
+
+    enhanceMiddlewareRootSpan(span);
+
+    expect(getName()).toBe('GET /foo');
+  });
+
+  it('does nothing when next.span_name is missing', () => {
+    const { span, getName } = makeSpan({ [ATTR_NEXT_SPAN_TYPE]: 'Middleware.execute' }, 'middleware');
+
+    enhanceMiddlewareRootSpan(span);
+
+    expect(getName()).toBe('middleware');
+  });
+
+  it('does nothing when next.span_name is an empty string', () => {
+    const { span, getName } = makeSpan(
+      { [ATTR_NEXT_SPAN_TYPE]: 'Middleware.execute', [ATTR_NEXT_SPAN_NAME]: '' },
+      'middleware',
+    );
+
+    enhanceMiddlewareRootSpan(span);
+
+    expect(getName()).toBe('middleware');
+  });
+
+  it('does nothing when next.span_name is not a string', () => {
+    const { span, getName } = makeSpan(
+      { [ATTR_NEXT_SPAN_TYPE]: 'Middleware.execute', [ATTR_NEXT_SPAN_NAME]: 123 },
+      'middleware',
+    );
+
+    enhanceMiddlewareRootSpan(span);
+
+    expect(getName()).toBe('middleware');
+  });
+
+  it('does nothing when the current name is empty', () => {
+    const { span, getName } = makeSpan(
+      { [ATTR_NEXT_SPAN_TYPE]: 'Middleware.execute', [ATTR_NEXT_SPAN_NAME]: 'middleware GET /foo' },
+      undefined,
+    );
+
+    enhanceMiddlewareRootSpan(span);
+
+    expect(getName()).toBeUndefined();
+  });
+
+  it.each([
+    ['middleware GET /foo', 'middleware GET'],
+    ['middleware POST /api/protected?token=abc', 'middleware POST'],
+    ['middleware DELETE /resources/[id]', 'middleware DELETE'],
+    ['middleware HEAD /', 'middleware HEAD'],
+  ])('collapses "%s" to "%s"', (spanName, expected) => {
+    const { span, getName } = makeSpan(
+      { [ATTR_NEXT_SPAN_TYPE]: 'Middleware.execute', [ATTR_NEXT_SPAN_NAME]: spanName },
+      spanName,
+    );
+
+    enhanceMiddlewareRootSpan(span);
+
+    expect(getName()).toBe(expected);
+  });
+
+  it('strips query and fragment from non-method-prefixed middleware names', () => {
+    const { span, getName } = makeSpan(
+      { [ATTR_NEXT_SPAN_TYPE]: 'Middleware.execute', [ATTR_NEXT_SPAN_NAME]: '/api/foo?token=abc#section' },
+      '/api/foo?token=abc#section',
+    );
+
+    enhanceMiddlewareRootSpan(span);
+
+    expect(getName()).toBe('/api/foo');
+  });
+
+  it('does not collapse names that do not match the middleware-method prefix', () => {
+    // CONNECT and TRACE are not in the regex - they fall through to query/fragment stripping
+    const { span, getName } = makeSpan(
+      { [ATTR_NEXT_SPAN_TYPE]: 'Middleware.execute', [ATTR_NEXT_SPAN_NAME]: 'middleware CONNECT /foo?bar=1' },
+      'middleware CONNECT /foo?bar=1',
+    );
+
+    enhanceMiddlewareRootSpan(span);
+
+    expect(getName()).toBe('middleware CONNECT /foo');
+  });
+});

packages/nextjs/test/edgeSdk.test.ts

@@ -2,6 +2,7 @@ import type { Integration } from '@sentry/core';
 import { GLOBAL_OBJ } from '@sentry/core';
 import * as SentryVercelEdge from '@sentry/vercel-edge';
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { TRANSACTION_ATTR_SHOULD_DROP_TRANSACTION } from '../src/common/span-attributes-with-logic-attached';
 import { init } from '../src/edge';
 
 // normally this is set as part of the build process, so mock it here
@@ -74,6 +75,30 @@ describe('Edge init()', () => {
     });
   });
 
+  describe('ignoreSpans', () => {
+    function getIgnoreSpans(): NonNullable<SentryVercelEdge.VercelEdgeOptions['ignoreSpans']> {
+      const callArgs = vercelEdgeInit.mock.calls[0]?.[0] as SentryVercelEdge.VercelEdgeOptions;
+      return callArgs.ignoreSpans ?? [];
+    }
+
+    it('appends the TRANSACTION_ATTR_SHOULD_DROP_TRANSACTION attribute filter', () => {
+      init({});
+      const patterns = getIgnoreSpans();
+
+      expect(patterns).toContainEqual({
+        attributes: { [TRANSACTION_ATTR_SHOULD_DROP_TRANSACTION]: true },
+      });
+    });
+
+    it('preserves user-provided ignoreSpans entries', () => {
+      init({ ignoreSpans: ['user-pattern', /custom-regex/] });
+      const patterns = getIgnoreSpans();
+
+      expect(patterns).toContain('user-pattern');
+      expect(patterns.some(p => p instanceof RegExp && p.source === 'custom-regex')).toBe(true);
+    });
+  });
+
   describe('environment option', () => {
     const originalEnv = process.env.SENTRY_ENVIRONMENT;