Your bug report

#31225: undocumented change in tail in 8.28 (pipe output monitoring)

which was filed against the coreutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 31225@debbugs.gnu.org.

-- 
31225: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=31225
GNU Bug Tracking System
Contact help-debbugs@gnu.org with problems