Use a dedicated cache.rate_limiter cache pool

Fixes #38365

Author: wouterj

DependencyInjection/Configuration.php

@@ -1808,7 +1808,7 @@ private function addRateLimiterSection(ArrayNodeDefinition $rootNode)
                                     ->end()
                                     ->scalarNode('cache_pool')
                                         ->info('The cache pool to use for storing the current limiter state')
-                                        ->defaultValue('cache.app')
+                                        ->defaultValue('cache.rate_limiter')
                                     ->end()
                                     ->scalarNode('storage_service')
                                         ->info('The service ID of a custom storage implementation, this precedes any configured "cache_pool"')

DependencyInjection/FrameworkExtension.php

@@ -2254,6 +2254,9 @@ private function registerRateLimiterConfiguration(array $config, ContainerBuilde
 
     public static function registerRateLimiter(ContainerBuilder $container, string $name, array $limiterConfig)
     {
+        // default configuration (when used by other DI extensions)
+        $limiterConfig += ['lock_factory' => 'lock.factory', 'cache_pool' => 'cache.rate_limiter'];
+
         $limiter = $container->setDefinition($limiterId = 'limiter.'.$name, new ChildDefinition('limiter'));
 
         $limiter->addArgument(new Reference($limiterConfig['lock_factory']));

Resources/config/rate_limiter.php

@@ -15,6 +15,10 @@
 
 return static function (ContainerConfigurator $container) {
     $container->services()
+        ->set('cache.rate_limiter')
+            ->parent('cache.app')
+            ->tag('cache.pool')
+
         ->set('limiter', Limiter::class)
             ->abstract()
             ->args([