gnus-article-mode-line-format

gnus-article-mode-line-format is a variable defined in `gnus-art.el'.
Its value is

"Gnus: %g %S%m"

Documentation:
*The format specification for the article mode line.
See `gnus-summary-mode-line-format' for a closer description.

The following additional specs are available:

%w The article washing status.
%m The number of MIME parts in the article.

You can customize this variable.

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