gnus-newsgroup-maximum-articles

gnus-newsgroup-maximum-articles is a variable defined in `gnus-sum.el'.
Its value is

nil

Documentation:
The maximum number of articles a newsgroup.
If this is a number, old articles in a newsgroup exceeding this number
are silently ignored. If it is nil, no article is ignored. Note that
setting this variable to a number might prevent you from reading very
old articles.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 22.2 of Emacs.