draft: Add metadata around transaction name changes

packages/core/src/baseclient.ts

@@ -35,6 +35,7 @@ import {
   SyncPromise,
   truncate,
   uuid4,
+  timestampInSeconds,
 } from '@sentry/utils';
 
 import { getEnvelopeEndpointWithUrlEncodedAuth } from './api';
@@ -653,6 +654,29 @@ export abstract class BaseClient<O extends ClientOptions> implements Client<O> {
           throw new SentryError('`beforeSend` returned `null`, will not send event.', 'log');
         }
 
+        const transactionInfo = processedEvent.transaction_info;
+        if (
+          processedEvent.type === 'transaction' &&
+          transactionInfo &&
+          processedEvent.transaction &&
+          processedEvent.transaction !== event.transaction
+        ) {
+          const source = 'custom';
+          event.transaction_info = {
+            ...transactionInfo,
+            source,
+            name_changes: [
+              ...transactionInfo.name_changes,
+              {
+                name: processedEvent.transaction,
+                source,
+                timestamp: timestampInSeconds(),
+                propagations: transactionInfo.propagations,
+              },
+            ],
+          };
+        }
+
         const session = scope && scope.getSession();
         if (!isTransaction && session) {
           this._updateSessionFromEvent(session, processedEvent);

packages/node/src/integrations/http.ts

@@ -185,6 +185,11 @@ function _createWrappedRequestMethodFactory(
             addRequestBreadcrumb('response', requestUrl, req, res);
           }
           if (tracingEnabled && span) {
+            const transaction = span.transaction;
+            if (transaction) {
+              transaction.metadata.propagations += 1;
+            }
+
             if (res.statusCode) {
               span.setHttpStatus(res.statusCode);
             }

packages/tracing/src/browser/request.ts

@@ -199,6 +199,7 @@ export function fetchCallback(
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     const options = (handlerData.args[1] = (handlerData.args[1] as { [key: string]: any }) || {});
     options.headers = addTracingHeaders(request, activeTransaction.getBaggage(), span, options);
+    activeTransaction.metadata.propagations += 1;
   }
 }
 
@@ -304,6 +305,7 @@ export function xhrCallback(
           BAGGAGE_HEADER_NAME,
           mergeAndSerializeBaggage(activeTransaction.getBaggage(), headerBaggageString),
         );
+        activeTransaction.metadata.propagations += 1;
       } catch (_) {
         // Error: InvalidStateError: Failed to execute 'setRequestHeader' on 'XMLHttpRequest': The object's state must be OPENED.
       }

packages/tracing/src/index.ts

@@ -27,7 +27,7 @@ export { BrowserTracing, BROWSER_TRACING_INTEGRATION_ID } from './browser';
 export { Span, spanStatusfromHttpCode } from './span';
 // eslint-disable-next-line deprecation/deprecation
 export { SpanStatus } from './spanstatus';
-export { Transaction } from './transaction';
+export { Transaction, generateTransactionNameChange } from './transaction';
 export { instrumentOutgoingRequests, defaultRequestInstrumentationOptions } from './browser';
 export { IdleTransaction } from './idletransaction';
 export { startIdleTransaction } from './hubextensions';

packages/tracing/src/transaction.ts

@@ -8,8 +8,17 @@ import {
   Transaction as TransactionInterface,
   TransactionContext,
   TransactionMetadata,
+  TransactionNameChange,
+  TransactionSource,
 } from '@sentry/types';
-import { createBaggage, dropUndefinedKeys, getSentryBaggageItems, isBaggageMutable, logger } from '@sentry/utils';
+import {
+  createBaggage,
+  dropUndefinedKeys,
+  getSentryBaggageItems,
+  isBaggageMutable,
+  logger,
+  timestampWithMs,
+} from '@sentry/utils';
 
 import { Span as SpanClass, SpanRecorder } from './span';
 
@@ -45,6 +54,8 @@ export class Transaction extends SpanClass implements TransactionInterface {
     this.metadata = {
       ...transactionContext.metadata,
       spanMetadata: {},
+      nameChanges: [],
+      propagations: 0,
     };
 
     this._trimEnd = transactionContext.trimEnd;
@@ -61,7 +72,9 @@ export class Transaction extends SpanClass implements TransactionInterface {
   /** Setter for `name` property, which also sets `source` */
   public set name(newName: string) {
     this._name = newName;
-    this.metadata.source = 'custom';
+    const source = 'custom';
+    this.metadata.source = source;
+    this.metadata.nameChanges.push(generateTransactionNameChange(source, this.metadata.propagations));
   }
 
   /**
@@ -70,6 +83,7 @@ export class Transaction extends SpanClass implements TransactionInterface {
   public setName(name: string, source: TransactionMetadata['source'] = 'custom'): void {
     this.name = name;
     this.metadata.source = source;
+    this.metadata.nameChanges.push(generateTransactionNameChange(source, this.metadata.propagations));
   }
 
   /**
@@ -156,6 +170,8 @@ export class Transaction extends SpanClass implements TransactionInterface {
       ...(metadata.source && {
         transaction_info: {
           source: metadata.source,
+          name_changes: metadata.nameChanges,
+          propagations: metadata.propagations,
         },
       }),
     };
@@ -273,3 +289,12 @@ export class Transaction extends SpanClass implements TransactionInterface {
     );
   }
 }
+
+/** Generate objects representing a transaction name change */
+export function generateTransactionNameChange(source: TransactionSource, propagations: number): TransactionNameChange {
+  return {
+    source,
+    timestamp: timestampWithMs(),
+    propagations,
+  };
+}

packages/types/src/event.ts

@@ -11,7 +11,7 @@ import { CaptureContext } from './scope';
 import { SdkInfo } from './sdkinfo';
 import { Severity, SeverityLevel } from './severity';
 import { Span } from './span';
-import { TransactionSource } from './transaction';
+import { TransactionNameChange, TransactionSource } from './transaction';
 import { User } from './user';
 
 /** JSDoc */
@@ -49,6 +49,9 @@ export interface Event {
   sdkProcessingMetadata?: { [key: string]: any };
   transaction_info?: {
     source: TransactionSource;
+    name_changes: TransactionNameChange[];
+    // The total number of propagations that happened
+    propagations: number;
   };
 }
 

packages/types/src/index.ts

@@ -73,6 +73,7 @@ export type {
   TransactionMetadata,
   TransactionSamplingMethod,
   TransactionSource,
+  TransactionNameChange,
 } from './transaction';
 export type {
   DurationUnit,

packages/types/src/transaction.ts

@@ -150,6 +150,12 @@ export interface TransactionMetadata {
 
   /** Metadata for the transaction's spans, keyed by spanId */
   spanMetadata: { [spanId: string]: { [key: string]: unknown } };
+
+  /** Metadata representing information about transaction name changes  */
+  nameChanges: TransactionNameChange[];
+
+  /** The total number of propagations that happened */
+  propagations: number;
 }
 
 /**
@@ -169,3 +175,15 @@ export type TransactionSource =
   | 'component'
   /** Name of a background task (e.g. a Celery task) */
   | 'task';
+
+/**
+ * Object representing metadata about when a transaction name was changed.
+ */
+export interface TransactionNameChange {
+  // unix timestamp when the name was changed
+  timestamp: number;
+  // new source
+  source: TransactionSource;
+  // number of propagations since start of transaction.
+  propagations: number;
+}