message: fix(apm): Check if performance.getEntries() exists
diff: @@ -561,7 +561,7 @@ export class Tracing implements Integration {
  * @param transactionSpan The transaction span
  */
  private static _addPerformanceEntries(transactionSpan: SpanClass): void {
  - if (!global.performance) {
  + if (!global.performance || !global.performance.getEntries) {
  // Gatekeeper if performance API not available
  return;
  }
  