I think I can't use global (string) var in processes. It's empty. When var is numeric, it works. I tried :
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$alerts->add(var_dump(VAR_TEST));
$alerts->add(var_dump('VAR_TEST'));
$alerts->add(var_dump("VAR_TEST"));
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$alerts->add(var_dump(VAR_TEST));
$alerts->add(var_dump('VAR_TEST'));
$alerts->add(var_dump("VAR_TEST"));
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$alerts->add(VAR_STRING);
$alerts->add(VAR_NUMBER);