Adjusting log level of volumio in systemd journal

All,
My journal (on my pi) is flushed with info: messages. Important /messages/notifications are being buried under the info: notifications :unamused:

Is there a supported way to adjust the loggging level.

If there is not a supported way to do it … unsupported ideas??

TIA,
Arjan

There is no supported way to do this.
Which also means: unsupported methods are, shockingly, not supported.

Why?
Because people love copy-paste adventures, and we don’t enjoy debugging mystery systems built from internet snippets and hope.

To stop “helpful” solutions from appearing and making support twice as painful later, I’m locking this topic.