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  1. or download this
    xml file:
    <global_status>
    ...
        my $now_value = scalar($_->[1]);
        my $last_value = $last_status_data->{value};
        $value_var = $now_value - $last_value;
    
  2. or download this
        my $last_value = $last_status_data->{value}+0;