public static class Parameters extends AbstractParameters {
 @Param(name = "thresholdDemand",
                description = "demand above threshold will raise an alert (kW)",
                formatString = "< %s kW",
                defaultValue = "100")

...
}


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    public String getFriendlyDescription(String format) {
        return String.format(format, new DecimalFormat(".##").format(value));
    }