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Showing content from https://symfony.com/doc/current/logging/processors.html below:

How to Add extra Data to Log Messages via a Processor (Symfony Docs)

Monolog allows you to process every record before logging it by adding some extra data. This is the role of a processor, which can be applied for the whole handler stack or only for a specific handler or channel.

A processor is a callable receiving the record as its first argument. Processors are configured using the monolog.processor DIC tag. See the reference about it.

Sometimes it is hard to tell which entries in the log belong to which session and/or request. The following example will add a unique token for each request using a processor:

Next, register your class as a service, as well as a formatter that uses the extra information:

Finally, set the formatter to be used on whatever handler you want:

If you use several handlers, you can also register a processor at the handler level or at the channel level instead of registering it globally (see the following sections).

When registering a new processor, instead of adding the tag manually in your configuration files, you can use the #[AsMonologProcessor] attribute to apply it on the processor class:

The #[AsMonologProcessor] attribute takes these optional arguments:

• channel: the logging channel the processor should be pushed to;
• handler: the handler the processor should be pushed to;
• method: the method that processes the records (useful when applying the attribute to the entire class instead of a single method).

3.8

The #[AsMonologProcessor] attribute was introduced in MonologBundle 3.8.

Symfony's MonologBridge provides processors that can be registered inside your application.

DebugProcessor

Adds additional information useful for debugging like a timestamp or an error message to the record.

TokenProcessor

Adds information from the current user's token to the record namely username, roles and whether the user is authenticated.

SwitchUserTokenProcessor

Adds information about the user who is impersonating the logged in user, namely username, roles and whether the user is authenticated.

WebProcessor

Overrides data from the request using the data inside Symfony's request object.

RouteProcessor

Adds information about current route (controller, action, route parameters).

ConsoleCommandProcessor

Adds information about the current console command.

By default, processors are applied to all channels. Add the channel option to the monolog.processor tag to only apply a processor for the given channel:

This work, including the code samples, is licensed under a

license.

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