Add logging when interpreter path changes (microsoft#21210)

For microsoft#21208

Author: Kartik Raj

src/client/common/interpreterPathService.ts

@@ -6,7 +6,7 @@
 import * as fs from 'fs-extra';
 import { inject, injectable } from 'inversify';
 import { ConfigurationChangeEvent, ConfigurationTarget, Event, EventEmitter, Uri } from 'vscode';
-import { traceError } from '../logging';
+import { traceError, traceVerbose } from '../logging';
 import { IApplicationEnvironment, IWorkspaceService } from './application/types';
 import { PythonSettings } from './configSettings';
 import { isTestExecution } from './constants';
@@ -56,6 +56,7 @@ export class InterpreterPathService implements IInterpreterPathService {
     public async onDidChangeConfiguration(event: ConfigurationChangeEvent) {
         if (event.affectsConfiguration(`python.${defaultInterpreterPathSetting}`)) {
             this._didChangeInterpreterEmitter.fire({ uri: undefined, configTarget: ConfigurationTarget.Global });
+            traceVerbose('Interpreter Path updated', `python.${defaultInterpreterPathSetting}`);
         }
     }
 
@@ -129,6 +130,7 @@ export class InterpreterPathService implements IInterpreterPathService {
         if (persistentSetting.value !== pythonPath) {
             await persistentSetting.updateValue(pythonPath);
             this._didChangeInterpreterEmitter.fire({ uri: resource, configTarget });
+            traceVerbose('Interpreter Path updated', settingKey, pythonPath);
         }
     }