Persistent change to log verbosity

How to persistently change logging verbosity?
I though calling logger.set_default_level service (newly action) to warning is the way.

But HA restart makes it set again to INFO.

Do I need to set it up in configuration.yaml?

Yes (AFAIK)

Or create an automation that set it via action on HA start.

thank you.

I’m curious why settings estabilished by the service call are not respected after restart.

Also this “default” in the service name seems misleading