fix(core): strip internal custom span name from streamed spans

Co-Authored-By: OpenAI ChatGPT <codex@openai.com>

Author: msonnb

dev-packages/browser-integration-tests/suites/tracing/browserTracingIntegration/pageload-updateSpanName/test.ts

@@ -34,7 +34,7 @@ sentryTest(
       [SENTRY_OP]: { type: 'string', value: 'pageload' },
     });
 
-    expect(attributes[SEMANTIC_ATTRIBUTE_SENTRY_CUSTOM_SPAN_NAME]).toEqual({ type: 'string', value: 'new name' });
+    expect(attributes[SEMANTIC_ATTRIBUTE_SENTRY_CUSTOM_SPAN_NAME]).toBeUndefined();
 
     expect(pageloadSpan.name).toBe('new name');
 

packages/core/src/utils/spanUtils.ts

@@ -270,12 +270,16 @@ function getOtelParentSpanId(span: OpenTelemetrySdkTraceBaseSpan): string | unde
  * The returned serilaized spans must not be consumed by users or SDK integrations.
  */
 export function streamedSpanJsonToSerializedSpan(spanJson: StreamedSpanJSON): SerializedStreamedSpan {
+  const attributes = serializeAttributes(spanJson.attributes);
+  // oxlint-disable-next-line typescript/no-dynamic-delete
+  delete attributes[SEMANTIC_ATTRIBUTE_SENTRY_CUSTOM_SPAN_NAME];
+
   return {
     ...spanJson,
     // We only ever send ended spans, but fall back to the start time (i.e. duration 0) so that
     // sent spans always carry an end timestamp.
     end_timestamp: spanJson.end_timestamp ?? spanJson.start_timestamp,
-    attributes: serializeAttributes(spanJson.attributes),
+    attributes,
     links: spanJson.links?.map(link => ({
       ...link,
       attributes: serializeAttributes(link.attributes),

packages/core/test/lib/utils/spanUtils.test.ts

@@ -6,6 +6,7 @@ import {
   Scope,
   SentryNonRecordingSpan,
   SentrySpan,
+  SEMANTIC_ATTRIBUTE_SENTRY_CUSTOM_SPAN_NAME,
   setCurrentClient,
   SPAN_STATUS_ERROR,
   SPAN_STATUS_OK,
@@ -681,6 +682,7 @@ describe('spanToStaticSpanJSON', () => {
           attr2: 2,
           attr3: true,
           attr4: [1, 2, 3],
+          [SEMANTIC_ATTRIBUTE_SENTRY_CUSTOM_SPAN_NAME]: 'test name',
           [SENTRY_OP]: 'test op',
           [SENTRY_ORIGIN]: 'auto',
         },