Specifies the number of logfile rotations to make when you
	type 'squid -k rotate'.  The default is 10, which will rotate
	with extensions 0 through 9.  Setting logfile_rotate to 0 will
	disable the file name rotation, but the logfiles are still closed
	and re-opened.  This will enable you to rename the logfiles
	yourself just before sending the rotate signal.

	Note, the 'squid -k rotate' command normally sends a USR1
	signal to the running squid process.  In certain situations
	(e.g. on Linux with Async I/O), USR1 is used for other
	purposes, so -k rotate uses another signal.  It is best to get
	in the habit of using 'squid -k rotate' instead of 'kill -USR1
	<pid>'.