Add telemetry for extension recommendations

USAGE_DATA.md

@@ -16,6 +16,7 @@ vscode-java has opt-in telemetry collection, provided by [vscode-redhat-telemetr
  * The total size (in bytes) of libraries that were indexed after project initialization
  * Information about the following settings. In the case of settings that store a well defined value (eg. path/url/string), we simply collect whether the setting has been set.
    * `java.settings.url`, `java.format.settings.url`, `java.quickfix.showAt`, `java.symbols.includeSourceMethodDeclarations`, `java.completion.guessMethodArguments`, `java.completion.postfix.enabled`, `java.cleanup.actionsOnSave`, `java.sharedIndexes.enabled`, `java.inlayHints.parameterNames.enabled`, `java.server.launchMode`, `java.autobuild.enabled`
+ * The extension name and the choice made when a recommendation to install a 3rd party extension is proposed
 
 ## What's included in the general telemetry data
 

src/recommendation/handlerImpl.ts

@@ -4,6 +4,7 @@
 
 import * as vscode from "vscode";
 import { IHandler } from "./handler";
+import { Telemetry } from "../telemetry";
 
 const KEY_RECOMMENDATION_USER_CHOICE_MAP = "recommendationUserChoice";
 
@@ -54,6 +55,10 @@ export class HandlerImpl implements IHandler {
 
 		const actions: Array<string> = Object.values(UserChoice);
 		const answer = await vscode.window.showInformationMessage(message, ...actions);
+		await Telemetry.sendTelemetry('recommendation', {
+			recommendation: extName,
+			choice:answer?.toLowerCase()
+		});
 		if (answer === UserChoice.install) {
 			await installExtensionCmdHandler(extName, extName);
 		}