gnus-bug-group-download-format-alist

gnus-bug-group-download-format-alist is a variable defined in `gnus-group.el'.
Its value is

((emacs . "http://debbugs.gnu.org/cgi/bugreport.cgi?bug=%s;mboxmaint=yes;mboxstat=yes")
 (debian . "http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=%s&mbox=yes;mboxmaint=yes"))

Documentation:
Alist of symbols for bug trackers and the corresponding URL format string.
The URL format string must contain a single "%s", specifying
the bug number, and browsing the URL must return mbox output.

You can customize this variable.

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