chore: fix this.rootSpan undefined bug in PageLoadInstrumentation (ap…

…psmithorg#36459)

app/client/src/UITelemetry/PageLoadInstrumentation.ts

@@ -41,15 +41,12 @@ export class PageLoadInstrumentation extends InstrumentationBase {
     this.ignoreResourceUrls = ignoreResourceUrls;
     // Start the root span for the page load
     this.rootSpan = startRootSpan("PAGE_LOAD", {}, 0);
-  }
 
-  init() {
-    // init method is present in the base class and needs to be implemented
-    // This is method is never called by the OpenTelemetry SDK
-    // Leaving it empty as it is done by other OpenTelemetry instrumentation classes
+    // Initialize the instrumentation after starting the root span
+    this.init();
   }
 
-  enable(): void {
+  init() {
     // Register connection change listener
     this.addConnectionAttributes();
 
@@ -71,6 +68,11 @@ export class PageLoadInstrumentation extends InstrumentationBase {
     }
   }
 
+  enable() {
+    // enable method is present in the base class and needs to be implemented
+    // Leaving it empty as there is no need to do anything here
+  }
+
   private addDeviceAttributes() {
     this.rootSpan.setAttributes({
       deviceMemory: (navigator as TNavigator).deviceMemory,