Add output channel for telemetry.log file (#58846)

* Add output channel for telemetry.log file

* Explain telemetry.log file in the first line

src/vs/code/electron-browser/sharedProcess/sharedProcessMain.ts

@@ -101,6 +101,8 @@ function main(server: Server, initData: ISharedProcessInitData, configuration: I
 		const environmentService = accessor.get(IEnvironmentService);
 		const { appRoot, extensionsPath, extensionDevelopmentLocationURI, isBuilt, installSourcePath } = environmentService;
 		const telemetryLogService = new FollowerLogService(logLevelClient, createSpdLogService('telemetry', initData.logLevel, environmentService.logsPath));
+		telemetryLogService.info('The below are logs for every telemetry event sent from VS Code once the log level is set to trace.');
+		telemetryLogService.info('===========================================================');
 
 		let appInsightsAppender: ITelemetryAppender = NullAppender;
 		if (product.aiConfig && product.aiConfig.asimovKey && isBuilt) {

src/vs/workbench/parts/logs/common/logConstants.ts

@@ -6,4 +6,5 @@
 export const mainLogChannelId = 'mainLog';
 export const sharedLogChannelId = 'sharedLog';
 export const rendererLogChannelId = 'rendererLog';
-export const extHostLogChannelId = 'extHostLog';
\ No newline at end of file
+export const extHostLogChannelId = 'extHostLog';
+export const telemetryLogChannelId = 'telemetryLog';
\ No newline at end of file

src/vs/workbench/parts/logs/electron-browser/logs.contribution.ts

@@ -17,12 +17,14 @@ import * as Constants from 'vs/workbench/parts/logs/common/logConstants';
 import { IWorkbenchActionRegistry, Extensions as WorkbenchActionExtensions } from 'vs/workbench/common/actions';
 import { SyncActionDescriptor } from 'vs/platform/actions/common/actions';
 import { OpenLogsFolderAction, SetLogLevelAction } from 'vs/workbench/parts/logs/electron-browser/logsActions';
+import { ILogService, LogLevel } from 'vs/platform/log/common/log';
 
 class LogOutputChannels extends Disposable implements IWorkbenchContribution {
 
 	constructor(
 		@IWindowService windowService: IWindowService,
 		@IEnvironmentService environmentService: IEnvironmentService,
+		@ILogService logService: ILogService
 	) {
 		super();
 		let outputChannelRegistry = Registry.as<IOutputChannelRegistry>(OutputExt.OutputChannels);
@@ -30,6 +32,14 @@ class LogOutputChannels extends Disposable implements IWorkbenchContribution {
 		outputChannelRegistry.registerChannel({ id: Constants.sharedLogChannelId, label: nls.localize('sharedLog', "Shared"), file: URI.file(join(environmentService.logsPath, `sharedprocess.log`)), log: true });
 		outputChannelRegistry.registerChannel({ id: Constants.rendererLogChannelId, label: nls.localize('rendererLog', "Window"), file: URI.file(join(environmentService.logsPath, `renderer${windowService.getCurrentWindowId()}.log`)), log: true });
 
+		const registerTelemetryChannel = (level) => {
+			if (level === LogLevel.Trace && !outputChannelRegistry.getChannel(Constants.telemetryLogChannelId)) {
+				outputChannelRegistry.registerChannel({ id: Constants.telemetryLogChannelId, label: nls.localize('telemetryLog', "Telemetry"), file: URI.file(join(environmentService.logsPath, `telemetry.log`)), log: true });
+			}
+		};
+		registerTelemetryChannel(logService.getLevel());
+		logService.onDidChangeLogLevel(registerTelemetryChannel);
+
 		const workbenchActionsRegistry = Registry.as<IWorkbenchActionRegistry>(WorkbenchActionExtensions.WorkbenchActions);
 		const devCategory = nls.localize('developer', "Developer");
 		workbenchActionsRegistry.registerWorkbenchAction(new SyncActionDescriptor(OpenLogsFolderAction, OpenLogsFolderAction.ID, OpenLogsFolderAction.LABEL), 'Developer: Open Log Folder', devCategory);