Add the WithLoggerChannel attribute to autoconfigure the channel

Attribute/WithLoggerChannel.php

@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bundle\MonologBundle\Attribute;
+
+#[\Attribute(\Attribute::TARGET_CLASS)]
+class WithLoggerChannel
+{
+    private string $channel;
+
+    public function __construct(string $channel)
+    {
+        $this->channel = $channel;
+    }
+
+    public function getChannel(): string
+    {
+        return $this->channel;
+    }
+}

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## Unreleased
 
+* Add a `WithLoggerChannel` attribute to autoconfigure the `monolog.logger` tag
 * Add support for Symfony 7
 * Remove support for Symfony 4
 * Add support for env placeholders in the `level` option of handlers

DependencyInjection/MonologExtension.php

@@ -24,6 +24,7 @@
 use Symfony\Bridge\Monolog\Processor\WebProcessor;
 use Symfony\Bridge\Monolog\Logger as LegacyLogger;
 use Symfony\Bundle\FullStack;
+use Symfony\Bundle\MonologBundle\Attribute\WithLoggerChannel;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\Argument\BoundArgument;
 use Symfony\Component\DependencyInjection\ChildDefinition;
@@ -135,6 +136,9 @@ public function load(array $configs, ContainerBuilder $container)
 
                 $definition->addTag('monolog.processor', $tagAttributes);
             });
+            $container->registerAttributeForAutoconfiguration(WithLoggerChannel::class, static function (ChildDefinition $definition, WithLoggerChannel $attribute): void {
+                $definition->addTag('monolog.logger', ['channel' => $attribute->getChannel()]);
+            });
         }
     }