How to exclude deprecation messages from logs in Symfony 4?

Question

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?

Answer 1

Exclude the php channel from the log handler:

Eg. 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.

Answer 2

Set the following env variable (eg. in .env.local):

SYMFONY_DEPRECATIONS_HELPER=weak