Removed yii\debug\Module::enabled.

apps/basic/config/web.php

 <?php
 
-return array(
+$config = array(
 	'id' => 'bootstrap',
 	'basePath' => dirname(__DIR__),
-	'preload' => array('debug'),
-	'modules' => array(
-		'debug' => array(
-			'class' => 'yii\debug\Module',
-			'enabled' => YII_ENV_DEV,
-		),
-	),
 	'components' => array(
 		'cache' => array(
 			'class' => 'yii\caching\FileCache',
@@ -32,3 +25,11 @@ return array(
 	),
 	'params' => require(__DIR__ . '/params.php'),
 );
+
+if (YII_ENV_DEV) {
+	$config['preload'][] = 'debug';
+	$config['modules']['debug'] = 'yii\debug\Module';
+	$config['modules']['gii'] = 'yii\gii\Module';
+}
+
+return $config;

framework/yii/debug/Module.php

@@ -25,7 +25,9 @@ class Module extends \yii\base\Module
 	 * by localhost.
 	 */
 	public $allowedIPs = array('127.0.0.1', '::1');
-
+	/**
+	 * @var string the namespace that controller classes are in.
+	 */
 	public $controllerNamespace = 'yii\debug\controllers';
 	/**
 	 * @var LogTarget
@@ -39,15 +41,16 @@ class Module extends \yii\base\Module
 	 * @var string the directory storing the debugger data files. This can be specified using a path alias.
 	 */
 	public $dataPath = '@runtime/debug';
+	/**
+	 * @var integer the maximum number of debug data files to keep. If there are more files generated,
+	 * the oldest ones will be removed.
+	 */
 	public $historySize = 50;
-	public $enabled = true;
+
 
 	public function init()
 	{
 		parent::init();
-		if (!$this->enabled) {
-			return;
-		}
 		$this->dataPath = Yii::getAlias($this->dataPath);
 		$this->logTarget = Yii::$app->getLog()->targets['debug'] = new LogTarget($this);
 		Yii::$app->getView()->on(View::EVENT_END_BODY, array($this, 'renderToolbar'));