The value of the {$HAPROXY.FRONT_SUTIL.MAX.WARN} macro in the "Template App HAProxy by HTTP" is incorrectly set to "80%". With the "%" suffix, it causes the trigger "TCP FRONTEND discovery: HAProxy TCP Frontend XXXXXXX: Session utilization is more than {$HAPROXY.FRONT_SUTIL.MAX.WARN}% for 5m" to fail (get Unknown status) with the error "80%" is not a numeric operand."

The value should be just "80" without the "%" sign.