metricData

Returns an instance of MetricData based on (modaName, weight), recording this metric's own domain. This is what a metric considered on its own should report.

Written as a separate function rather than as a default argument on the three-argument form so that it exists as a two-argument method on the JVM. Kotlin default arguments emit no such overload, and the usual remedy does not apply here: @JvmOverloads cannot be used on an interface method. A Java caller would otherwise have to pass a domain it has no opinion about.

Returns an instance of MetricData based on (modaName, weight), recording the supplied domain.

The reportedDomain is the domain to record. A model that fitted the domain to the scores it saw supplies the fitted domain, since that is the domain its recorded values were computed over and reporting the declared one alongside them would not explain them. A caller with no such adjustment to report should use the two-argument form.