gnus-verbose

gnus-verbose is a variable defined in `gnus-util.el'.
Its value is

6

Documentation:
*Integer that says how verbose Gnus should be.
The higher the number, the more messages Gnus will flash to say what
it's doing. At zero, Gnus will be totally mute; at five, Gnus will
display most important messages; and at ten, Gnus will keep on
jabbering all the time.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.