ref: Rename baggage env header to trace

Matches how this information will be captured and processed in Relay.

Author: AbhiPrasad

packages/core/src/envelope.ts

@@ -146,6 +146,6 @@ function createEventEnvelopeHeaders(
     sent_at: new Date().toISOString(),
     ...(sdkInfo && { sdk: sdkInfo }),
     ...(!!tunnel && { dsn: dsnToString(dsn) }),
-    ...(baggage && !isBaggageEmpty(baggage) && { baggage: serializeBaggage(baggage) }),
+    ...(baggage && !isBaggageEmpty(baggage) && { trace: serializeBaggage(baggage) }),
   };
 }

packages/integration-tests/suites/tracing/baggage/test.ts

@@ -1,5 +1,5 @@
 import { expect } from '@playwright/test';
-import { Event, EventEnvelopeHeaders } from '@sentry/types';
+import { EventEnvelopeHeaders } from '@sentry/types';
 
 import { sentryTest } from '../../../utils/fixtures';
 import { envelopeHeaderRequestParser, getFirstSentryEnvelopeRequest } from '../../../utils/helpers';
@@ -9,8 +9,8 @@ sentryTest('should send baggage data in transaction envelope header', async ({ g
 
   const envHeader = await getFirstSentryEnvelopeRequest<EventEnvelopeHeaders>(page, url, envelopeHeaderRequestParser);
 
-  expect(envHeader.baggage).toBeDefined();
-  expect(envHeader.baggage).toEqual(
+  expect(envHeader.trace).toBeDefined();
+  expect(envHeader.trace).toEqual(
     'sentry-environment=production,sentry-transaction=testTransactionBaggage,sentry-userid=user123,sentry-usersegment=segmentB',
   );
 });

packages/types/src/envelope.ts

@@ -59,7 +59,7 @@ export type SessionItem =
   | BaseEnvelopeItem<SessionAggregatesItemHeaders, SessionAggregates>;
 export type ClientReportItem = BaseEnvelopeItem<ClientReportItemHeaders, ClientReport>;
 
-export type EventEnvelopeHeaders = { event_id: string; sent_at: string; baggage?: string };
+export type EventEnvelopeHeaders = { event_id: string; sent_at: string; trace?: string };
 type SessionEnvelopeHeaders = { sent_at: string };
 type ClientReportEnvelopeHeaders = BaseEnvelopeHeaders;