use strict;
use warnings;

use Parse::RecDescent;
use Data::Dumper;

my $g = Parse::RecDescent->new(<<'EOG');
main: head row(s) /\Z/ { [$item[1], @{$item[2]}]; }
 | <error>
head: /.*/ /-*/ { $item[1]; }
row: date time num { [@item[1..3]]; }
date: /\d\d\d\d-\d\d-\d\d/ 
time: /\d\d:\d\d:\d\d/
num: /[\d\.]+/
EOG

my $data = join '', <DATA>;

print Dumper($g->main($data));

__DATA__
Timestamp 10.72.218.82:cpu_busy
------------------------------------------------------------------------------- 
2009-11-05 17:59:52 1.501
2009-10-15 17:39:52 2.501
2009-12-25 17:19:52 3.501