Modify Debugger life cycle

config/di-console.php

@@ -30,5 +30,9 @@
             ),
             'excludedClasses' => $params['yiisoft/yii-debug']['excludedClasses'],
         ],
+        'reset' => function () {
+            /** @var Debugger $this */
+            $this->allowStart = true;
+        },
     ],
 ];

config/di-web.php

@@ -32,5 +32,9 @@
             ),
             'excludedClasses' => $params['yiisoft/yii-debug']['excludedClasses'],
         ],
+        'reset' => function () {
+            /** @var Debugger $this */
+            $this->allowStart = true;
+        },
     ],
 ];

src/Debugger.php

@@ -30,6 +30,16 @@ final class Debugger
      */
     private readonly DataNormalizer $dataNormalizer;
 
+    /**
+     * @var string|null ID of the current request. `null` if debugger is not active.
+     */
+    private ?string $id = null;
+
+    /**
+     * @var bool Whether debugger startup is allowed.
+     */
+    private bool $allowStart = true;
+
     /**
      * @param StorageInterface $storage The storage to store collected data.
      * @param CollectorInterface[] $collectors Collectors to be used.
@@ -57,11 +67,6 @@ public function __construct(
         register_shutdown_function([$this, 'stop']);
     }
 
-    /**
-     * @var string|null ID of the current request. `null` if debugger is not active.
-     */
-    private ?string $id = null;
-
     /**
      * Returns whether debugger is active.
      *
@@ -91,7 +96,17 @@ public function getId(): string
      */
     public function start(object $event): void
     {
+        if (!$this->allowStart) {
+            return;
+        }
+
         if (!$this->debuggerStartupPolicy->satisfies($event)) {
+            $this->allowStart = false;
+            $this->kill();
+            return;
+        }
+
+        if ($this->isActive()) {
             return;
         }