Hey,
there is dedicated logger service for plugins. It’s ID in the DI container is “pluginlogger”. Here is an example: https://github.com/shopwareLabs/SwagPaymentPayPalUnified/blob/master/Resources/services/services.xml#L119
Since Shopware 5.6 you are even able to create your own plugin specific logger: Shopware 5 upgrade guide
I will adjust the article to make it more clear, what should be used.
Best regards from Schöppingen
Michael Telgmann