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How to Configure Monolog to Exclude Specific HTTP Codes from the Log

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How to Configure Monolog to Exclude Specific HTTP Codes from the Log¶

New in version 4.1: The ability to exclude log messages based on their status codes was introduced in Symfony 4.1 and MonologBundle 3.3.

Sometimes your logs become flooded with unwanted HTTP errors, for example, 403s and 404s. When using a fingers_crossed handler, you can exclude logging these HTTP codes based on the MonologBundle configuration:

YAML

# config/packages/prod/monolog.yaml
monolog:
    handlers:
        main:
            # ...
            type: fingers_crossed
            handler: ...
            excluded_http_codes: [403, 404, { 400: ['^/foo', '^/bar'] }]

XML

<!-- config/packages/prod/monolog.xml -->
<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:monolog="http://symfony.com/schema/dic/monolog"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        http://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/monolog
        http://symfony.com/schema/dic/monolog/monolog-1.0.xsd">

    <monolog:config>
        <monolog:handler type="fingers_crossed" name="main" handler="...">
            <!-- ... -->
            <monolog:excluded-http-code code="403">
                <monolog:url>^/foo</monolog:url>
                <monolog:url>^/bar</monolog:url>
            </monolog:excluded-http-code>
            <monolog:excluded-http-code code="404" />
        </monolog:handler>
    </monolog:config>
</container>

PHP

// config/packages/prod/monolog.php
$container->loadFromExtension('monolog', [
    'handlers' => [
        'main' => [
            // ...
            'type'                => 'fingers_crossed',
            'handler'             => ...,
            'excluded_http_codes' => [403, 404],
        ],
    ],
]);

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