return core

src/vs/workbench/services/experiment/electron-browser/experimentService.ts

@@ -71,6 +71,8 @@ class ExperimentServiceFilterProvider implements IExperimentationFilterProvider
 				return this.machineId;
 			case Filters.Language:
 				return platform.language;
+			case Filters.ExtensionName:
+				return 'vscode-core'; // always return vscode-core for exp service
 			case Filters.TargetPopulation:
 				return this.targetPopulation;
 			default:
@@ -98,6 +100,7 @@ https://experimentation.visualstudio.com/Analysis%20and%20Experimentation/_git/A
 "X-VSCode–AppVersion": "appversion",
 "X-VSCode-Build": "build",
 "X-MSEdge-ClientId": "clientid",
+"X-VSCode-ExtensionName": "extensionname",
 "X-VSCode-TargetPopulation": "targetpopulation",
 "X-VSCode-Language": "language"
 */
@@ -128,6 +131,11 @@ enum Filters {
 	 */
 	ClientId = 'X-MSEdge-ClientId',
 
+	/**
+	 * Extension header.
+	 */
+	ExtensionName = 'X-VSCode-ExtensionName',
+
 	/**
 	 * The language in use by VS Code
 	 */