diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index f5a29b6..6b03358 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -12,7 +12,7 @@ jobs:
             matrix:
                 operating-system: [ ubuntu-latest ]
                 php: [ '8.1', '8.2' ]
-                symfony: ['5.3.*', '5.4.*', '6.0.*', '6.1.*', '6.2.*']
+                symfony: ['6.3.*']
 
         steps:
             - uses: actions/checkout@master
diff --git a/composer.json b/composer.json
index 6aa0716..7acd718 100644
--- a/composer.json
+++ b/composer.json
@@ -13,8 +13,8 @@
     ],
     "require": {
         "php": ">=8.1",
-        "symfony/framework-bundle": "^5.3|^6.0",
-        "symfony/serializer": "^5.3|^6.0"
+        "symfony/framework-bundle": "^6.3",
+        "symfony/serializer": "^6.3"
     },
     "require-dev": {
         "nyholm/symfony-bundle-test": "^2.0",
@@ -22,14 +22,14 @@
         "whatwedo/php-coding-standard": "^1.0",
         "phpstan/phpstan": "^1.7",
         "phpunit/phpunit": "^9.5",
-        "symfony/browser-kit": "^5.3|^6.0",
-        "symfony/css-selector": "^5.3|^6.0",
-        "symfony/phpunit-bridge": "^6.2",
+        "symfony/browser-kit": "^6.3",
+        "symfony/css-selector": "^6.3",
+        "symfony/phpunit-bridge": "^6.3",
         "doctrine/doctrine-bundle": "^2.7",
         "doctrine/doctrine-migrations-bundle": "^3.2",
         "doctrine/orm": "^2.14",
-        "symfony/twig-bundle": "^5.3|^6.0",
-        "symfony/messenger": "^5.3|^6.0",
+        "symfony/twig-bundle": "^6.3",
+        "symfony/messenger": "^6.3",
         "symfony/mercure-bundle": "^0.3"
     },
     "autoload": {
diff --git a/phpstan.neon b/phpstan.neon
index 328bcdb..f390efa 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -4,4 +4,4 @@ parameters:
         - src
         - tests
     bootstrapFiles:
-        - vendor/bin/.phpunit/phpunit-9.5-0/vendor/autoload.php
+        - vendor/bin/.phpunit/phpunit-9.6-0/vendor/autoload.php
diff --git a/src/Command/CheckCommand.php b/src/Command/CheckCommand.php
index ea8e164..8294b9f 100644
--- a/src/Command/CheckCommand.php
+++ b/src/Command/CheckCommand.php
@@ -20,6 +20,7 @@
 class CheckCommand extends Command
 {
     public function __construct(
+        protected int $warningExitCode,
         protected MonitoringManager $monitoringManager
     ) {
         parent::__construct();
@@ -30,7 +31,12 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         $io = new SymfonyStyle($input, $output);
         $this->printResult($io, $this->monitoringManager->getResult());
 
-        return $this->monitoringManager->isSuccessful() ? static::SUCCESS : static::FAILURE;
+        if ($this->monitoringManager->isSuccessful() && $this->monitoringManager->isWarning()) {
+            return $this->warningExitCode;
+        } elseif ($this->monitoringManager->isSuccessful()) {
+            return self::SUCCESS;
+        }
+        return self::FAILURE;
     }
 
     private function printResult(SymfonyStyle $io, $result, $previousGroup = null, $level = 0): void
diff --git a/src/Controller/ApiController.php b/src/Controller/ApiController.php
index 277e774..3b816a2 100644
--- a/src/Controller/ApiController.php
+++ b/src/Controller/ApiController.php
@@ -20,8 +20,8 @@ public function __construct(
 
     public function __invoke(Request $request, MonitoringManager $monitoringManager, SerializerInterface $serializer): Response
     {
-        if ($this->authToken !== null &&
-            $request->headers->get('X-Auth-Token', '') !== $this->authToken) {
+        if ($this->authToken !== null
+            && $request->headers->get('X-Auth-Token', '') !== $this->authToken) {
             return new Response('Unauthorized', 401);
         }
 
diff --git a/src/DependencyInjection/CompilerPass/AttributeCompilerPass.php b/src/DependencyInjection/CompilerPass/AttributeCompilerPass.php
index ee18720..00cc92b 100644
--- a/src/DependencyInjection/CompilerPass/AttributeCompilerPass.php
+++ b/src/DependencyInjection/CompilerPass/AttributeCompilerPass.php
@@ -11,7 +11,7 @@
 
 class AttributeCompilerPass implements CompilerPassInterface
 {
-    public function process(ContainerBuilder $container)
+    public function process(ContainerBuilder $container): void
     {
         $definition = $container->getDefinition(MonitoringManager::class);
 
diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index 7682e49..3eec9e9 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -75,6 +75,10 @@ public function getConfigTreeBuilder(): TreeBuilder
                         ->end()
                     ->end()
                 ->end()
+                ->integerNode('warning_exit_code')
+                    ->defaultValue(1)
+                    ->info('Exit code for warning state (default 1)')
+                ->end()
             ->end()
         ;
 
diff --git a/src/DependencyInjection/whatwedoMonitorExtension.php b/src/DependencyInjection/whatwedoMonitorExtension.php
index 75ec39d..256e3ac 100644
--- a/src/DependencyInjection/whatwedoMonitorExtension.php
+++ b/src/DependencyInjection/whatwedoMonitorExtension.php
@@ -4,7 +4,6 @@
 
 namespace whatwedo\MonitorBundle\DependencyInjection;
 
-use PHPUnit\Framework\MockObject\Api;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Extension\PrependExtensionInterface;
@@ -23,12 +22,12 @@
  */
 class whatwedoMonitorExtension extends Extension implements PrependExtensionInterface
 {
-    public function load(array $configs, ContainerBuilder $container)
+    public function load(array $configs, ContainerBuilder $container): void
     {
         $configuration = new Configuration();
         $config = $this->processConfiguration($configuration, $configs);
 
-        $loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__ . '/../Resources/config'));
+        $loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
         $loader->load('services.yaml');
 
         // tag monitoring attributes (sensors and metrics)
@@ -68,9 +67,15 @@ public function configureMonitoring(ContainerBuilder $container, array $config)
         $container->findDefinition(QueuedMessages::class)
             ->setArgument(0, $config['monitoring']['metric']['messenger']['queued_messages']['warning_threshold'] ?? 5)
             ->setArgument(1, $config['monitoring']['metric']['messenger']['queued_messages']['critical_threshold'] ?? 10);
+        if (!(isset($config['endpoint']['command']['enabled'])
+            && ! $config['endpoint']['command']['enabled'])) {
+            $container->findDefinition(CheckCommand::class)
+                ->setArgument(0, $config['warning_exit_code'] ?? 1)
+            ;
+        }
     }
 
-    public function prepend(ContainerBuilder $container)
+    public function prepend(ContainerBuilder $container): void
     {
     }
 }
diff --git a/src/Manager/MonitoringManager.php b/src/Manager/MonitoringManager.php
index 5abd217..1b6d9f5 100644
--- a/src/Manager/MonitoringManager.php
+++ b/src/Manager/MonitoringManager.php
@@ -7,7 +7,6 @@
 use whatwedo\MonitorBundle\Enum\MetricStateEnum;
 use whatwedo\MonitorBundle\Enum\SensorStateEnum;
 use whatwedo\MonitorBundle\Monitoring\AttributeInterface;
-use whatwedo\MonitorBundle\Monitoring\Metric\AbstractMetric;
 use whatwedo\MonitorBundle\Monitoring\Sensor\AbstractSensor;
 
 class MonitoringManager
@@ -19,19 +18,24 @@ class MonitoringManager
 
     protected ?bool $isSuccessful = null;
 
+    protected ?bool $hasWarnings = null;
+
     public function run(): void
     {
         $this->isSuccessful = true;
+        $this->hasWarnings = false;
 
         foreach ($this->attributes as $attribute) {
             if ($attribute->isEnabled()) {
                 $attribute->run();
-                if (($attribute instanceof AbstractSensor
-                        && $attribute->getState() !== SensorStateEnum::SUCCESSFUL)
-                    || ($attribute instanceof AbstractMetric
-                        && $attribute->getState() !== MetricStateEnum::OK)) {
+                $wasSuccessful = $this->wasSuccessful($attribute);
+                $wasWarning = $this->wasWarning($attribute);
+                if (!$wasSuccessful && !$wasWarning) {
                     $this->isSuccessful = false;
                 }
+                if ($wasWarning) {
+                    $this->hasWarnings = true;
+                }
             }
         }
     }
@@ -81,6 +85,15 @@ public function isSuccessful(): bool
         return $this->isSuccessful;
     }
 
+    public function isWarning(): bool
+    {
+        if ($this->hasWarnings === null) {
+            $this->run();
+        }
+
+        return $this->hasWarnings;
+    }
+
     public function addAttribute(AttributeInterface $attribute): void
     {
         $this->attributes[$attribute::class] = $attribute;
@@ -90,4 +103,18 @@ public function getAttribute(string $className): AttributeInterface
     {
         return $this->attributes[$className];
     }
+
+    private function wasSuccessful(AttributeInterface $attribute): bool
+    {
+        return $attribute instanceof AbstractSensor
+            ? $attribute->getState() === SensorStateEnum::SUCCESSFUL
+            : $attribute->getState() === MetricStateEnum::OK;
+    }
+
+    private function wasWarning(AttributeInterface $abstract): bool
+    {
+        return $abstract instanceof AbstractSensor
+            ? $abstract->getState() === SensorStateEnum::WARNING
+            : $abstract->getState() === MetricStateEnum::WARNING;
+    }
 }
diff --git a/src/Monitoring/Metric/AbstractMetric.php b/src/Monitoring/Metric/AbstractMetric.php
index f7a3ff8..4b8059a 100644
--- a/src/Monitoring/Metric/AbstractMetric.php
+++ b/src/Monitoring/Metric/AbstractMetric.php
@@ -16,7 +16,7 @@ abstract class AbstractMetric implements AttributeInterface
     public function getState(): MetricStateEnum
     {
         if ($this->state === null) {
-            throw new \RuntimeException(__CLASS__ . '::$state is not set.');
+            throw new \RuntimeException(__CLASS__.'::$state is not set.');
         }
 
         return $this->state;
diff --git a/src/Monitoring/Sensor/AbstractSensor.php b/src/Monitoring/Sensor/AbstractSensor.php
index cf99b1d..dab6082 100644
--- a/src/Monitoring/Sensor/AbstractSensor.php
+++ b/src/Monitoring/Sensor/AbstractSensor.php
@@ -16,7 +16,7 @@ abstract class AbstractSensor implements AttributeInterface
     public function getState(): SensorStateEnum
     {
         if ($this->state === null) {
-            throw new \RuntimeException(__CLASS__ . '::$state is not set.');
+            throw new \RuntimeException(__CLASS__.'::$state is not set.');
         }
 
         return $this->state;
diff --git a/src/Monitoring/Sensor/Database/DoctrineDbal.php b/src/Monitoring/Sensor/Database/DoctrineDbal.php
index 2f75ee5..78c494d 100644
--- a/src/Monitoring/Sensor/Database/DoctrineDbal.php
+++ b/src/Monitoring/Sensor/Database/DoctrineDbal.php
@@ -52,7 +52,7 @@ public function run(): void
     public static function getSubscribedServices(): array
     {
         return [
-            '?' . ManagerRegistry::class,
+            '?'.ManagerRegistry::class,
         ];
     }
 }
diff --git a/src/Normalizer/AttributeNormalizer.php b/src/Normalizer/AttributeNormalizer.php
index 44ce132..4ee8904 100644
--- a/src/Normalizer/AttributeNormalizer.php
+++ b/src/Normalizer/AttributeNormalizer.php
@@ -10,7 +10,7 @@
 use whatwedo\MonitorBundle\Monitoring\Metric\AbstractMetric;
 use whatwedo\MonitorBundle\Monitoring\Sensor\AbstractSensor;
 
-class AttributeNormalizer implements NormalizerInterface, CacheableSupportsMethodInterface
+class AttributeNormalizer implements NormalizerInterface
 {
     /**
      * @param AttributeInterface $object
@@ -39,8 +39,10 @@ public function supportsNormalization($data, string $format = null, array $conte
         return $data instanceof AttributeInterface;
     }
 
-    public function hasCacheableSupportsMethod(): bool
+    public function getSupportedTypes(?string $format): array
     {
-        return true;
+        return [
+            AttributeInterface::class => true,
+        ];
     }
 }
diff --git a/src/Normalizer/EnumNormalizer.php b/src/Normalizer/EnumNormalizer.php
index 27c8476..da0c79f 100644
--- a/src/Normalizer/EnumNormalizer.php
+++ b/src/Normalizer/EnumNormalizer.php
@@ -4,15 +4,11 @@
 
 namespace whatwedo\MonitorBundle\Normalizer;
 
-use Symfony\Component\Serializer\Normalizer\CacheableSupportsMethodInterface;
 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 use whatwedo\MonitorBundle\Enum\MetricStateEnum;
 use whatwedo\MonitorBundle\Enum\SensorStateEnum;
 
-/**
- * symfony 5.3 compatibility (https://github.com/symfony/symfony/pull/40830 has been merged into 5.4)
- */
-class EnumNormalizer implements NormalizerInterface, CacheableSupportsMethodInterface
+class EnumNormalizer implements NormalizerInterface
 {
     /**
      * @param MetricStateEnum|SensorStateEnum $object
@@ -24,12 +20,14 @@ public function normalize($object, string $format = null, array $context = []):
 
     public function supportsNormalization($data, string $format = null, array $context = []): bool
     {
-        return ! class_exists('Symfony\Component\Serializer\Normalizer\BackedEnumNormalizer')
-            && ($data instanceof MetricStateEnum || $data instanceof SensorStateEnum);
+        return $data instanceof MetricStateEnum || $data instanceof SensorStateEnum;
     }
 
-    public function hasCacheableSupportsMethod(): bool
+    public function getSupportedTypes(?string $format): array
     {
-        return true;
+        return [
+            MetricStateEnum::class => true,
+            SensorStateEnum::class => true,
+        ];
     }
 }
diff --git a/src/whatwedoMonitorBundle.php b/src/whatwedoMonitorBundle.php
index be82a8b..4c21605 100644
--- a/src/whatwedoMonitorBundle.php
+++ b/src/whatwedoMonitorBundle.php
@@ -10,7 +10,7 @@
 
 class whatwedoMonitorBundle extends Bundle
 {
-    public function build(ContainerBuilder $container)
+    public function build(ContainerBuilder $container): void
     {
         parent::build($container);
 
diff --git a/tests/BundleInitializationTest.php b/tests/BundleInitializationTest.php
index 1169dad..22369fd 100644
--- a/tests/BundleInitializationTest.php
+++ b/tests/BundleInitializationTest.php
@@ -27,7 +27,7 @@ public function testDisabledApi(): void
     {
         $kernel = self::bootKernel([
             'config' => static function (TestKernel $kernel) {
-                $kernel->addTestConfig(__DIR__ . '/config/disabled_api.yml');
+                $kernel->addTestConfig(__DIR__.'/config/disabled_api.yml');
             },
         ]);
 
@@ -38,7 +38,7 @@ public function testDisabledController(): void
     {
         $kernel = self::bootKernel([
             'config' => static function (TestKernel $kernel) {
-                $kernel->addTestConfig(__DIR__ . '/config/disabled_controller.yml');
+                $kernel->addTestConfig(__DIR__.'/config/disabled_controller.yml');
             },
         ]);
 
@@ -49,7 +49,7 @@ public function testDisabledCommand(): void
     {
         $kernel = self::bootKernel([
             'config' => static function (TestKernel $kernel) {
-                $kernel->addTestConfig(__DIR__ . '/config/disabled_command.yml');
+                $kernel->addTestConfig(__DIR__.'/config/disabled_command.yml');
             },
         ]);
 
diff --git a/tests/Command/CheckCommandTest.php b/tests/Command/CheckCommandTest.php
index 6f61025..8a418bf 100644
--- a/tests/Command/CheckCommandTest.php
+++ b/tests/Command/CheckCommandTest.php
@@ -18,7 +18,7 @@ public function testSuccessful(): void
     {
         $kernel = self::bootKernel([
             'config' => static function (TestKernel $kernel) {
-                $kernel->addTestConfig(__DIR__ . '/../config/dummy_successful.yml');
+                $kernel->addTestConfig(__DIR__.'/../config/dummy_successful.yml');
             },
         ]);
 
@@ -29,4 +29,36 @@ public function testSuccessful(): void
         $commandTester->execute([]);
         self::assertEquals(0, $commandTester->getStatusCode());
     }
+
+    public function testWarning(): void
+    {
+        $kernel = self::bootKernel([
+            'config' => static function (TestKernel $kernel) {
+                $kernel->addTestConfig(__DIR__.'/../config/dummy_warning.yml');
+            },
+        ]);
+
+        $application = new Application($kernel);
+        $command = $application->find('whatwedo:monitor:check');
+
+        $commandTester = new CommandTester($command);
+        $commandTester->execute([]);
+        self::assertEquals(1, $commandTester->getStatusCode());
+    }
+
+    public function testWarningCustomExitCode(): void
+    {
+        $kernel = self::bootKernel([
+            'config' => static function (TestKernel $kernel) {
+                $kernel->addTestConfig(__DIR__.'/../config/dummy_warning_custom_exit_code.yml');
+            },
+        ]);
+
+        $application = new Application($kernel);
+        $command = $application->find('whatwedo:monitor:check');
+
+        $commandTester = new CommandTester($command);
+        $commandTester->execute([]);
+        self::assertEquals(2, $commandTester->getStatusCode());
+    }
 }
diff --git a/tests/Controller/ApiControllerTest.php b/tests/Controller/ApiControllerTest.php
index 1ba8bfb..dccd93d 100644
--- a/tests/Controller/ApiControllerTest.php
+++ b/tests/Controller/ApiControllerTest.php
@@ -19,7 +19,7 @@ public function testApiJson(): void
         $client = $this->getClient($this->getApiKernel());
         $client->request('GET', '/api.json');
         $this->assertEquals(503, $client->getResponse()->getStatusCode());
-        $this->assertJsonStringEqualsJsonFile(__DIR__ . '/responses/result.json', $client->getResponse()->getContent());
+        $this->assertJsonStringEqualsJsonFile(__DIR__.'/responses/result.json', $client->getResponse()->getContent());
     }
 
     public function testApiJsonPretty(): void
@@ -27,7 +27,7 @@ public function testApiJsonPretty(): void
         $client = $this->getClient($this->getApiKernel());
         $client->request('GET', '/api.json?pretty');
         $this->assertEquals(503, $client->getResponse()->getStatusCode());
-        $this->assertJsonStringEqualsJsonFile(__DIR__ . '/responses/result_pretty.json', $client->getResponse()->getContent());
+        $this->assertJsonStringEqualsJsonFile(__DIR__.'/responses/result_pretty.json', $client->getResponse()->getContent());
     }
 
     public function testApiXml(): void
@@ -35,7 +35,7 @@ public function testApiXml(): void
         $client = $this->getClient($this->getApiKernel());
         $client->request('GET', '/api.xml');
         $this->assertEquals(503, $client->getResponse()->getStatusCode());
-        $this->assertXmlStringEqualsXmlFile(__DIR__ . '/responses/result.xml', $client->getResponse()->getContent());
+        $this->assertXmlStringEqualsXmlFile(__DIR__.'/responses/result.xml', $client->getResponse()->getContent());
     }
 
     public function testApiProtectedSuccessful(): void
@@ -67,8 +67,8 @@ protected function getApiKernel(): KernelInterface
     {
         return self::bootKernel([
             'config' => static function (TestKernel $kernel) {
-                $kernel->addTestConfig(__DIR__ . '/../config/dummy.yml');
-                $kernel->addTestRoutingFile(__DIR__ . '/config/routes.yml');
+                $kernel->addTestConfig(__DIR__.'/../config/dummy.yml');
+                $kernel->addTestRoutingFile(__DIR__.'/config/routes.yml');
             },
         ]);
     }
@@ -77,8 +77,8 @@ protected function getProtectedApiKernel(): KernelInterface
     {
         return self::bootKernel([
             'config' => static function (TestKernel $kernel) {
-                $kernel->addTestRoutingFile(__DIR__ . '/config/routes.yml');
-                $kernel->addTestConfig(__DIR__ . '/config/protected_api.yml');
+                $kernel->addTestRoutingFile(__DIR__.'/config/routes.yml');
+                $kernel->addTestConfig(__DIR__.'/config/protected_api.yml');
             },
         ]);
     }
diff --git a/tests/Controller/DashboardControllerTest.php b/tests/Controller/DashboardControllerTest.php
index a011d2d..626a4ff 100644
--- a/tests/Controller/DashboardControllerTest.php
+++ b/tests/Controller/DashboardControllerTest.php
@@ -36,8 +36,8 @@ protected function getApiKernel(): KernelInterface
     {
         return self::bootKernel([
             'config' => static function (TestKernel $kernel) {
-                $kernel->addTestRoutingFile(__DIR__ . '/config/routes.yml');
-                $kernel->addTestConfig(__DIR__ . '/../config/dummy.yml');
+                $kernel->addTestRoutingFile(__DIR__.'/config/routes.yml');
+                $kernel->addTestConfig(__DIR__.'/../config/dummy.yml');
                 $kernel->addTestBundle(TwigBundle::class);
             },
         ]);
diff --git a/tests/Monitoring/Sensor/Database/DoctrineDbalTest.php b/tests/Monitoring/Sensor/Database/DoctrineDbalTest.php
index 0bc73ee..55f0609 100644
--- a/tests/Monitoring/Sensor/Database/DoctrineDbalTest.php
+++ b/tests/Monitoring/Sensor/Database/DoctrineDbalTest.php
@@ -17,13 +17,13 @@ class DoctrineDbalTest extends AbstractMonitoringTest
     public static function configureSuccessfulKernel(TestKernel $kernel): void
     {
         $kernel->addTestBundle(DoctrineBundle::class);
-        $kernel->addTestConfig(__DIR__ . '/config/doctrine_dbal_successful.yml');
+        $kernel->addTestConfig(__DIR__.'/config/doctrine_dbal_successful.yml');
     }
 
     public static function configureFailureKernel(TestKernel $kernel): void
     {
         $kernel->addTestBundle(DoctrineBundle::class);
-        $kernel->addTestConfig(__DIR__ . '/config/doctrine_dbal_error.yml');
+        $kernel->addTestConfig(__DIR__.'/config/doctrine_dbal_error.yml');
     }
 
     protected function getMonitoringClass(): string
diff --git a/tests/Monitoring/Sensor/Database/DoctrineMigrationsTest.php b/tests/Monitoring/Sensor/Database/DoctrineMigrationsTest.php
index 80726a8..699816f 100644
--- a/tests/Monitoring/Sensor/Database/DoctrineMigrationsTest.php
+++ b/tests/Monitoring/Sensor/Database/DoctrineMigrationsTest.php
@@ -54,16 +54,16 @@ public static function configureSuccessfulKernel(TestKernel $kernel): void
     {
         $kernel->addTestBundle(DoctrineBundle::class);
         $kernel->addTestBundle(DoctrineMigrationsBundle::class);
-        $kernel->addTestConfig(__DIR__ . '/config/doctrine_dbal_successful.yml');
-        $kernel->addTestConfig(__DIR__ . '/config/doctrine_migrations.yml');
+        $kernel->addTestConfig(__DIR__.'/config/doctrine_dbal_successful.yml');
+        $kernel->addTestConfig(__DIR__.'/config/doctrine_migrations.yml');
     }
 
     public static function configureFailureKernel(TestKernel $kernel): void
     {
         $kernel->addTestBundle(DoctrineBundle::class);
         $kernel->addTestBundle(DoctrineMigrationsBundle::class);
-        $kernel->addTestConfig(__DIR__ . '/config/doctrine_dbal_successful.yml');
-        $kernel->addTestConfig(__DIR__ . '/config/doctrine_migrations.yml');
+        $kernel->addTestConfig(__DIR__.'/config/doctrine_dbal_successful.yml');
+        $kernel->addTestConfig(__DIR__.'/config/doctrine_migrations.yml');
     }
 
     protected function getMonitoringClass(): string
diff --git a/tests/Monitoring/Sensor/Service/MercureTest.php b/tests/Monitoring/Sensor/Service/MercureTest.php
index f4dbd21..7eb8366 100644
--- a/tests/Monitoring/Sensor/Service/MercureTest.php
+++ b/tests/Monitoring/Sensor/Service/MercureTest.php
@@ -41,7 +41,7 @@ public function testFailure(): void
     public static function configureSuccessfulKernel(TestKernel $kernel): void
     {
         $kernel->addTestBundle(MercureBundle::class);
-        $kernel->addTestConfig(__DIR__ . '/config/mercure.yml');
+        $kernel->addTestConfig(__DIR__.'/config/mercure.yml');
     }
 
     protected function getHub(): MockObject&HubInterface
diff --git a/tests/UseTestKernelTrait.php b/tests/UseTestKernelTrait.php
index 715c56d..9af062c 100644
--- a/tests/UseTestKernelTrait.php
+++ b/tests/UseTestKernelTrait.php
@@ -15,7 +15,7 @@ protected static function createKernel(array $options = []): KernelInterface
         /** @var TestKernel $kernel */
         $kernel = parent::createKernel($options);
         $kernel->addTestBundle(whatwedoMonitorBundle::class);
-        $kernel->addTestConfig(__DIR__ . '/config/framework.yml');
+        $kernel->addTestConfig(__DIR__.'/config/framework.yml');
         $kernel->handleOptions($options);
 
         return $kernel;
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 59bf713..904fd98 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -4,6 +4,6 @@
 
 use Symfony\Component\Filesystem\Filesystem;
 
-require \dirname(__DIR__) . '/vendor/autoload.php';
+require \dirname(__DIR__).'/vendor/autoload.php';
 
-(new Filesystem())->remove(__DIR__ . '/../var');
+(new Filesystem())->remove(__DIR__.'/../var');
diff --git a/tests/config/dummy_warning.yml b/tests/config/dummy_warning.yml
new file mode 100644
index 0000000..34f3c99
--- /dev/null
+++ b/tests/config/dummy_warning.yml
@@ -0,0 +1,6 @@
+services:
+  whatwedo\MonitorBundle\Tests\Monitoring\Sensor\Dummy\WarningDummySensor:
+    tags: [ 'whatwedo_monitor.attribute' ]
+
+  whatwedo\MonitorBundle\Tests\Monitoring\Metric\Dummy\WarningDummyMetric:
+    tags: [ 'whatwedo_monitor.attribute' ]
diff --git a/tests/config/dummy_warning_custom_exit_code.yml b/tests/config/dummy_warning_custom_exit_code.yml
new file mode 100644
index 0000000..af12e0c
--- /dev/null
+++ b/tests/config/dummy_warning_custom_exit_code.yml
@@ -0,0 +1,9 @@
+services:
+  whatwedo\MonitorBundle\Tests\Monitoring\Sensor\Dummy\WarningDummySensor:
+    tags: [ 'whatwedo_monitor.attribute' ]
+
+  whatwedo\MonitorBundle\Tests\Monitoring\Metric\Dummy\WarningDummyMetric:
+    tags: [ 'whatwedo_monitor.attribute' ]
+
+whatwedo_monitor:
+  warning_exit_code: 2