accessibility service: log accessibility metrics

fixes #81964

src/vs/workbench/services/accessibility/node/accessibilityService.ts

@@ -10,6 +10,14 @@ import { IContextKeyService } from 'vs/platform/contextkey/common/contextkey';
 import { IConfigurationService } from 'vs/platform/configuration/common/configuration';
 import { AbstractAccessibilityService } from 'vs/platform/accessibility/common/abstractAccessibilityService';
 import { registerSingleton } from 'vs/platform/instantiation/common/extensions';
+import { ITelemetryService } from 'vs/platform/telemetry/common/telemetry';
+
+interface AccessibilityMetrics {
+	enabled: boolean;
+}
+type AccessibilityMetricsClassification = {
+	enabled: { classification: 'SystemMetaData', purpose: 'FeatureInsight' };
+};
 
 export class AccessibilityService extends AbstractAccessibilityService implements IAccessibilityService {
 
@@ -20,7 +28,8 @@ export class AccessibilityService extends AbstractAccessibilityService implement
 	constructor(
 		@IWorkbenchEnvironmentService private readonly environmentService: IWorkbenchEnvironmentService,
 		@IContextKeyService readonly contextKeyService: IContextKeyService,
-		@IConfigurationService readonly configurationService: IConfigurationService
+		@IConfigurationService readonly configurationService: IConfigurationService,
+		@ITelemetryService private readonly _telemetryService: ITelemetryService
 	) {
 		super(contextKeyService, configurationService);
 	}
@@ -51,6 +60,10 @@ export class AccessibilityService extends AbstractAccessibilityService implement
 
 		this._accessibilitySupport = accessibilitySupport;
 		this._onDidChangeAccessibilitySupport.fire();
+
+		if (accessibilitySupport === AccessibilitySupport.Enabled) {
+			this._telemetryService.publicLog2<AccessibilityMetrics, AccessibilityMetricsClassification>('accessibility', { enabled: true });
+		}
 	}
 
 	getAccessibilitySupport(): AccessibilitySupport {