my $x=0;
while(<DATA>){
    next unless /\w/;
    my($server,$datetime,$metric,$value) = (split)[0,1,2,3];
    $value =~ s/,//g ;
    my $ddhh = substr $datetime,0,13;
    my $dd   = substr $datetime,0,10;
    $d{$dd    }{$server}{$metric}{max} = ($x < $value) ? $value : $x;
    $d{$dd    }{$server}{$metric}{min} = ($x > $value) ? $value : $x ;
    $h{$ddhh  }{$server}{$metric}{max} = ($x < $value) ? $value : $x;
    $h{$ddhh  }{$server}{$metric}{min} = ($x > $value) ? $value : $x ;
    $ser{$server} = 1;
    $met{$metric} = 1;
}