diff --git a/src/Metadata/Resource/Factory/ExtractorResourceMetadataCollectionFactory.php b/src/Metadata/Resource/Factory/ExtractorResourceMetadataCollectionFactory.php
index 93740809c60..ca5b46bf571 100644
--- a/src/Metadata/Resource/Factory/ExtractorResourceMetadataCollectionFactory.php
+++ b/src/Metadata/Resource/Factory/ExtractorResourceMetadataCollectionFactory.php
@@ -26,6 +26,9 @@
 use ApiPlatform\Metadata\Put;
 use ApiPlatform\Metadata\Resource\DeprecationMetadataTrait;
 use ApiPlatform\Metadata\Resource\ResourceMetadataCollection;
+use Psr\Log\LoggerInterface;
+use Psr\Log\NullLogger;
+use Symfony\Component\Serializer\NameConverter\CamelCaseToSnakeCaseNameConverter;
 
 /**
  * Creates a resource metadata from {@see Resource} extractors (XML, YAML).
@@ -38,12 +41,14 @@ final class ExtractorResourceMetadataCollectionFactory implements ResourceMetada
     private $extractor;
     private $decorated;
     private $defaults;
+    private $logger;
 
-    public function __construct(ResourceExtractorInterface $extractor, ResourceMetadataCollectionFactoryInterface $decorated = null, array $defaults = [])
+    public function __construct(ResourceExtractorInterface $extractor, ResourceMetadataCollectionFactoryInterface $decorated = null, array $defaults = [], LoggerInterface $logger = null)
     {
         $this->extractor = $extractor;
         $this->decorated = $decorated;
         $this->defaults = $defaults;
+        $this->logger = $logger ?? new NullLogger();
     }
 
     /**
@@ -182,13 +187,7 @@ private function buildGraphQlOperations(?array $data, ApiResource $resource): ar
 
     private function getOperationWithDefaults(ApiResource $resource, HttpOperation $operation): HttpOperation
     {
-        foreach (($this->defaults['attributes'] ?? []) as $key => $value) {
-            [$key, $value] = $this->getKeyValue($key, $value);
-            if (null === $operation->{'get'.ucfirst($key)}()) {
-                $operation = $operation->{'with'.ucfirst($key)}($value);
-            }
-        }
-
+        // Inherit from resource defaults
         foreach (get_class_methods($resource) as $methodName) {
             if (0 !== strpos($methodName, 'get')) {
                 continue;
@@ -205,6 +204,65 @@ private function getOperationWithDefaults(ApiResource $resource, HttpOperation $
             $operation = $operation->{'with'.substr($methodName, 3)}($value);
         }
 
+        $operation = $operation->withExtraProperties(array_merge(
+            $resource->getExtraProperties(),
+            $operation->getExtraProperties()
+        ));
+
+        // Add global defaults attributes to the operation
+        $operation = $this->addGlobalDefaults($operation);
+
+        if ($operation->getRouteName()) {
+            /** @var HttpOperation $operation */
+            $operation = $operation->withName($operation->getRouteName());
+        }
+
+        // Check for name conflict
+        if ($operation->getName() && null !== ($operations = $resource->getOperations())) {
+            if (!$operations->has($operation->getName())) {
+                return $operation;
+            }
+
+            $this->logger->warning(sprintf('The operation "%s" already exists on the resource "%s", pick a different name or leave it empty. In the meantime we will generate a unique name.', $operation->getName(), $resource->getClass()));
+            /** @var HttpOperation $operation */
+            $operation = $operation->withName('');
+        }
+
         return $operation;
     }
+
+    private function addGlobalDefaults(HttpOperation $operation): HttpOperation
+    {
+        if (!$this->camelCaseToSnakeCaseNameConverter) {
+            $this->camelCaseToSnakeCaseNameConverter = new CamelCaseToSnakeCaseNameConverter();
+        }
+
+        $extraProperties = [];
+        foreach ($this->defaults as $key => $value) {
+            $upperKey = ucfirst($this->camelCaseToSnakeCaseNameConverter->denormalize($key));
+            $getter = 'get'.$upperKey;
+
+            if (!method_exists($operation, $getter)) {
+                if (!isset($extraProperties[$key])) {
+                    $extraProperties[$key] = $value;
+                }
+
+                continue;
+            }
+
+            $currentValue = $operation->{$getter}();
+
+            if (\is_array($currentValue) && $currentValue) {
+                $operation = $operation->{'with'.$upperKey}(array_merge($value, $currentValue));
+            }
+
+            if (null !== $currentValue) {
+                continue;
+            }
+
+            $operation = $operation->{'with'.$upperKey}($value);
+        }
+
+        return $operation->withExtraProperties(array_merge($extraProperties, $operation->getExtraProperties()));
+    }
 }
diff --git a/src/Symfony/Bundle/Resources/config/metadata/resource.xml b/src/Symfony/Bundle/Resources/config/metadata/resource.xml
index 3e011de0d62..333037d623f 100644
--- a/src/Symfony/Bundle/Resources/config/metadata/resource.xml
+++ b/src/Symfony/Bundle/Resources/config/metadata/resource.xml
@@ -21,6 +21,7 @@
             <argument type="service" id="api_platform.metadata.resource_extractor.xml" />
             <argument type="service" id="api_platform.metadata.resource.metadata_collection_factory.xml.inner" />
             <argument>%api_platform.defaults%</argument>
+            <argument type="service" id="logger" on-invalid="null" />
         </service>
 
         <service id="api_platform.metadata.resource.metadata_collection_factory.not_exposed_operation" class="ApiPlatform\Metadata\Resource\Factory\NotExposedOperationResourceMetadataCollectionFactory" decorates="api_platform.metadata.resource.metadata_collection_factory" decoration-priority="700" public="false">
diff --git a/src/Symfony/Bundle/Resources/config/metadata/yaml.xml b/src/Symfony/Bundle/Resources/config/metadata/yaml.xml
index 2e417e7c578..f3d0209f3f3 100644
--- a/src/Symfony/Bundle/Resources/config/metadata/yaml.xml
+++ b/src/Symfony/Bundle/Resources/config/metadata/yaml.xml
@@ -24,6 +24,7 @@
             <argument type="service" id="api_platform.metadata.resource_extractor.yaml" />
             <argument type="service" id="api_platform.metadata.resource.metadata_collection_factory.yaml.inner" />
             <argument>%api_platform.defaults%</argument>
+            <argument type="service" id="logger" on-invalid="null" />
         </service>
 
         <service id="api_platform.metadata.property.metadata_factory.yaml" class="ApiPlatform\Metadata\Property\Factory\ExtractorPropertyMetadataFactory" decorates="api_platform.metadata.property.metadata_factory" decoration-priority="20" public="false">
diff --git a/tests/Metadata/Extractor/ResourceMetadataCompatibilityTest.php b/tests/Metadata/Extractor/ResourceMetadataCompatibilityTest.php
index b340b05543a..fbe7ef5069f 100644
--- a/tests/Metadata/Extractor/ResourceMetadataCompatibilityTest.php
+++ b/tests/Metadata/Extractor/ResourceMetadataCompatibilityTest.php
@@ -37,6 +37,7 @@
 use ApiPlatform\Tests\Metadata\Extractor\Adapter\YamlResourceAdapter;
 use PHPUnit\Framework\AssertionFailedError;
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Serializer\NameConverter\CamelCaseToSnakeCaseNameConverter;
 
 /**
  * Ensures XML and YAML mappings are fully compatible with ApiResource.
@@ -49,6 +50,9 @@ final class ResourceMetadataCompatibilityTest extends TestCase
 
     private const RESOURCE_CLASS = Comment::class;
     private const SHORT_NAME = 'Comment';
+    private const DEFAULTS = [
+        'route_prefix' => '/v1',
+    ];
     private const FIXTURES = [
         null,
         [
@@ -208,6 +212,10 @@ final class ResourceMetadataCompatibilityTest extends TestCase
                         'priority' => 200,
                         'extraProperties' => [
                             'foo' => 'bar',
+                            'custom_property' => 'Lorem ipsum dolor sit amet',
+                            'another_custom_property' => [
+                                'Lorem ipsum' => 'Dolor sit amet',
+                            ],
                         ],
                     ],
                 ],
@@ -329,6 +337,10 @@ final class ResourceMetadataCompatibilityTest extends TestCase
                     'priority' => 200,
                     'extraProperties' => [
                         'foo' => 'bar',
+                        'custom_property' => 'Lorem ipsum dolor sit amet',
+                        'another_custom_property' => [
+                            'Lorem ipsum' => 'Dolor sit amet',
+                        ],
                     ],
                 ],
                 [
@@ -420,7 +432,7 @@ public function testValidMetadata(string $extractorClass, ResourceAdapterInterfa
 
         try {
             $extractor = new $extractorClass($adapter(self::RESOURCE_CLASS, $parameters, self::FIXTURES));
-            $factory = new ExtractorResourceMetadataCollectionFactory($extractor);
+            $factory = new ExtractorResourceMetadataCollectionFactory($extractor, null, self::DEFAULTS);
             $collection = $factory->create(self::RESOURCE_CLASS);
         } catch (\Exception $exception) {
             throw new AssertionFailedError('Failed asserting that the schema is valid according to '.ApiResource::class, 0, $exception);
@@ -595,6 +607,7 @@ private function withGraphQlOperations(array $values, ?array $fixtures): array
 
     private function getOperationWithDefaults(ApiResource $resource, HttpOperation $operation): HttpOperation
     {
+        // Inherit from resource defaults
         foreach (get_class_methods($resource) as $methodName) {
             if (0 !== strpos($methodName, 'get')) {
                 continue;
@@ -611,6 +624,65 @@ private function getOperationWithDefaults(ApiResource $resource, HttpOperation $
             $operation = $operation->{'with'.substr($methodName, 3)}($value);
         }
 
+        $operation = $operation->withExtraProperties(array_merge(
+            $resource->getExtraProperties(),
+            $operation->getExtraProperties()
+        ));
+
+        // Add global defaults attributes to the operation
+        $operation = $this->addGlobalDefaults($operation);
+
+        if ($operation->getRouteName()) {
+            /** @var HttpOperation $operation */
+            $operation = $operation->withName($operation->getRouteName());
+        }
+
+        // Check for name conflict
+        if ($operation->getName() && null !== ($operations = $resource->getOperations())) {
+            if (!$operations->has($operation->getName())) {
+                return $operation;
+            }
+
+            /** @var HttpOperation $operation */
+            $operation = $operation->withName('');
+        }
+
         return $operation;
     }
+
+    private function addGlobalDefaults(HttpOperation $operation): HttpOperation
+    {
+        if (!$this->camelCaseToSnakeCaseNameConverter) {
+            $this->camelCaseToSnakeCaseNameConverter = new CamelCaseToSnakeCaseNameConverter();
+        }
+
+        $extraProperties = [];
+        foreach (self::DEFAULTS as $key => $value) {
+            $upperKey = ucfirst($this->camelCaseToSnakeCaseNameConverter->denormalize($key));
+            $getter = 'get'.$upperKey;
+
+            if (!method_exists($operation, $getter)) {
+                if (!isset($extraProperties[$key])) {
+                    $extraProperties[$key] = $value;
+                }
+
+                continue;
+            }
+
+            $currentValue = $operation->{$getter}();
+
+            /* @phpstan-ignore-next-line */
+            if (\is_array($currentValue) && $currentValue && \is_array($value) && $value) {
+                $operation = $operation->{'with'.$upperKey}(array_merge($value, $currentValue));
+            }
+
+            if (null !== $currentValue) {
+                continue;
+            }
+
+            $operation = $operation->{'with'.$upperKey}($value);
+        }
+
+        return $operation->withExtraProperties(array_merge($extraProperties, $operation->getExtraProperties()));
+    }
 }