Changing include-wxstatus.php is not recommended -- it is subject to replacement when new weather software is added to the template set.
Changing the wxstatus.php itself, is the recommended method (as that page is not replaced with updates).
Here's what I do on my site:
To wxstatus.php, add (in the area reserved for additions)
$BOdir = './BOmap/cache/';
$BOfilesize = filesize("${BOdir}strikes.txt");
do_check('Cron animation Blitzortung <a href="${BOdir}gen-BO-maps-log.txt">status</a>'.
'<br/> Strikes file size '.show_size($BOfilesize) ,
'${BOdir}BONorthAmerica-ani.gif',60*5+15,'file');
function show_size($size)
{
if (!is_numeric($size)) {return false;}
else
{
if ($size >= 1073741824) {$size = round($size/1073741824*100)/100 ." GB";}
elseif ($size >= 1048576) {$size = round($size/1048576*100)/100 ." MB";}
elseif ($size >= 1024) {$size = round($size/1024*100)/100 ." KB";}
else {$size = $size . " B";}
return $size;
}
} // end show_size