Dashboard. At the top just right of “System Information” would be a good place to place a push notice. With X to close. 
Seriously.
I had NO idea. I probably wasn’t paying attention? I’m going from baffled about lack of community involvement to stunned.
EDIT: I know open source, privacy, etc…
This could be user configureable.
One level would be ‘code red’ something is serious enough we want to give you a heads up.. Can not turn off.
Other levels possible…