The Free On-line Dictionary of Computing (19 January 2023):

include war

   Excessive multi-leveled including within a discussion
   thread, a practice that tends to annoy readers.  In a forum
   with high-traffic newsgroups, such as Usenet, this can lead
   to flames and the urge to start a kill file.


The Jargon File (version 4.4.7, 29 Dec 2003):

include war
 n.

    Excessive multi-leveled inclusion within a discussion thread, a practice
    that tends to annoy readers. In a forum with high-traffic newsgroups, such
    as Usenet, this can lead to flames and the urge to start a kill file.