add event for chat view openend (microsoft#278195)

Author: sbatten

src/vs/workbench/contrib/chat/browser/chatViewPane.ts

@@ -20,6 +20,7 @@ import { ILayoutService } from '../../../../platform/layout/browser/layoutServic
 import { ILogService } from '../../../../platform/log/common/log.js';
 import { IOpenerService } from '../../../../platform/opener/common/opener.js';
 import { IStorageService, StorageScope, StorageTarget } from '../../../../platform/storage/common/storage.js';
+import { ITelemetryService } from '../../../../platform/telemetry/common/telemetry.js';
 import { editorBackground } from '../../../../platform/theme/common/colorRegistry.js';
 import { IThemeService } from '../../../../platform/theme/common/themeService.js';
 import { IViewPaneOptions, ViewPane } from '../../../browser/parts/views/viewPane.js';
@@ -72,6 +73,7 @@ export class ChatViewPane extends ViewPane implements IViewWelcomeDelegate {
 		@ILogService private readonly logService: ILogService,
 		@ILayoutService private readonly layoutService: ILayoutService,
 		@IChatSessionsService private readonly chatSessionsService: IChatSessionsService,
+		@ITelemetryService private readonly telemetryService: ITelemetryService,
 	) {
 		super(options, keybindingService, contextMenuService, configurationService, contextKeyService, viewDescriptorService, instantiationService, openerService, themeService, hoverService);
 
@@ -185,6 +187,12 @@ export class ChatViewPane extends ViewPane implements IViewWelcomeDelegate {
 
 		this._register(this.instantiationService.createInstance(ChatViewWelcomeController, parent, this, this.chatOptions.location));
 
+		type ChatViewPaneOpenedClassification = {
+			owner: 'sbatten';
+			comment: 'Event fired when the chat view pane is opened';
+		};
+
+		this.telemetryService.publicLog2<{}, ChatViewPaneOpenedClassification>('chatViewPaneOpened');
 		const scopedInstantiationService = this._register(this.instantiationService.createChild(new ServiceCollection([IContextKeyService, this.scopedContextKeyService])));
 		const locationBasedColors = this.getLocationBasedColors();
 		const editorOverflowNode = this.layoutService.getContainer(getWindow(parent)).appendChild($('.chat-editor-overflow.monaco-editor'));