If the file does not get altered for a while, File::Tail gets suspicious 
and starts checking if the file was truncated, or moved and recreated. 
If anything like that had happened, File::Tail will quietly reopen the file, and continue reading. 
The only way to affect what happens on reopen is by setting the reset_tail parameter (see below). 
The effect of this is that the scripts need not be aware when the logfiles were rotated, 
they will just quietly work on.