Returns the last Fact, chronologically, from a metric or KPI FactList. If there are no Facts in the list or all of the Facts contain null or NaN values return a MissingFact which has no data and not breakdown. The MissingFact is a special case of a Fact object that can be useful to simplify defensive coding checks.

// get the latest 
var latest = metrics.get('critical issues').getLatest();

// return the value and the breakdown
return latest;
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