diff --git a/src/Collector/Collector.php b/src/Collector/Collector.php
index 612335e..2e7cda7 100644
--- a/src/Collector/Collector.php
+++ b/src/Collector/Collector.php
@@ -33,7 +33,7 @@ public function collect(): Result
             foreach ($executingGroup->metrics as $executingMetric) {
                 $metricHandler = $this->runtimeConfiguration->getMetric($executingMetric->metric);
 
-                $event = new BeforeMetricCalculate($metricHandler, $executingMetric->options);
+                $event = new BeforeMetricCalculate($executingMetric, $executingMetric->options);
                 $this->runtimeConfiguration->getEventDispatcher()->dispatch($event);
 
                 $metricResult = $metricHandler->calculate($event->getOptions());
diff --git a/src/Configuration/ConfigurationFile.php b/src/Configuration/ConfigurationFile.php
index 0c41f16..b8ee263 100644
--- a/src/Configuration/ConfigurationFile.php
+++ b/src/Configuration/ConfigurationFile.php
@@ -97,7 +97,7 @@ private static function buildMetricGroupConfig(array $metricGroupConfig): array
             $metricGroup[] = new MetricGroup(
                 $groupIdentifier,
                 $options['title'] ?? '',
-                self::convertToMetricConfig($options['metrics'] ?? []),
+                self::convertToMetricConfig($groupIdentifier, $options['metrics'] ?? []),
             );
         }
 
@@ -109,7 +109,7 @@ private static function buildMetricGroupConfig(array $metricGroupConfig): array
      *
      * @return list<Metric>
      */
-    private static function convertToMetricConfig(array $metricConfig): array
+    private static function convertToMetricConfig(string $groupIdentifier, array $metricConfig): array
     {
         $metrics = [];
         foreach ($metricConfig as $identifier => $options) {
@@ -123,6 +123,9 @@ private static function convertToMetricConfig(array $metricConfig): array
                 // Take the metric not from the key but from the option
                 $metric = $options['metric'];
                 unset($options['metric']);
+            } else {
+                // Because the name of the metric was utilized as key it is not unique, so combine it with the group
+                $identifier = $groupIdentifier . '.' . $identifier;
             }
 
             $metrics[] = new Metric($identifier, $metric, $title, $options);
diff --git a/src/Configuration/ConfigurationFile/MetricGroup.php b/src/Configuration/ConfigurationFile/MetricGroup.php
index bce93a7..bcd6763 100644
--- a/src/Configuration/ConfigurationFile/MetricGroup.php
+++ b/src/Configuration/ConfigurationFile/MetricGroup.php
@@ -6,13 +6,13 @@
 
 use Panaly\Configuration\Exception\InvalidConfigurationFile;
 
-class MetricGroup
+readonly class MetricGroup
 {
     /** @param list<Metric> $metrics */
     public function __construct(
-        public readonly string $identifier,
-        public readonly string $title,
-        public readonly array $metrics,
+        public string $identifier,
+        public string $title,
+        public array $metrics,
     ) {
         if ($this->identifier === '') {
             throw InvalidConfigurationFile::metricGroupMustNotHaveABlankName();
diff --git a/src/Event/BeforeMetricCalculate.php b/src/Event/BeforeMetricCalculate.php
index 4710311..d8499c2 100644
--- a/src/Event/BeforeMetricCalculate.php
+++ b/src/Event/BeforeMetricCalculate.php
@@ -4,12 +4,12 @@
 
 namespace Panaly\Event;
 
-use Panaly\Plugin\Plugin\Metric;
+use Panaly\Configuration\ConfigurationFile\Metric;
 
 final class BeforeMetricCalculate
 {
     public function __construct(
-        public readonly Metric $plugin,
+        public readonly Metric $metricConfiguration,
         private array $options,
     ) {
     }
diff --git a/tests/Configuration/ConfigurationFileTest.php b/tests/Configuration/ConfigurationFileTest.php
index b5c0607..cc39e0a 100644
--- a/tests/Configuration/ConfigurationFileTest.php
+++ b/tests/Configuration/ConfigurationFileTest.php
@@ -79,13 +79,13 @@ public function testThatCreatingWithMetricGroupsIsValid(): void
         self::assertCount(3, $configurationFile->metricGroups[0]->metrics);
 
         // The "baz" metric
-        self::assertSame('baz', $configurationFile->metricGroups[0]->metrics[0]->identifier);
+        self::assertSame('foo.baz', $configurationFile->metricGroups[0]->metrics[0]->identifier);
         self::assertSame('baz', $configurationFile->metricGroups[0]->metrics[0]->metric);
         self::assertSame('foo_baz', $configurationFile->metricGroups[0]->metrics[0]->title);
         self::assertSame(['foo' => 'bar'], $configurationFile->metricGroups[0]->metrics[0]->options);
 
         // The "quo" metric
-        self::assertSame('quo', $configurationFile->metricGroups[0]->metrics[1]->identifier);
+        self::assertSame('foo.quo', $configurationFile->metricGroups[0]->metrics[1]->identifier);
         self::assertSame('quo', $configurationFile->metricGroups[0]->metrics[1]->metric);
         self::assertNull($configurationFile->metricGroups[0]->metrics[1]->title);
         self::assertSame(['foo' => 'baz'], $configurationFile->metricGroups[0]->metrics[1]->options);