[FIXED] How to exclude deprecation messages from logs in Symfony 4?

Issue

I have migrated an application from Symfony 3.4 to Symfony 4.4.

Now I have a lot of deprecations for each request/ Sf command (I can't fix that deprecations).

How can I exclude deprecations from the log for this Symfony App?

Solution

Exclude the php channel from the main log handler:

config/packages/prod/monolog.yaml:

monolog:
    handlers:
        main:
            type:  stream
            path:  %kernel.logs_dir%/%kernel.environment%.log
            level: debug
            formatter: monolog.formatter.session_request
            channels:
             -  '!php' # <----------- add this line

Leave deprecation messages in the dev mode though. You should be aware of the changes in upstream packages.

Answered By - emix