Create a copy of the BreakdownSet with the Breakdown values converted into a percentage of the total Breakdown. This is a common use or Breakdown metadata where the proportion is more useful than the absolute value.
The following example is a complex KPI formula that uses the % breakdown of Issue Priority to find the % time spent on the highest priority issue.
//Get the recorded time metric
var timeSpent = metrics.get('*Time*');
//Get the breakdown for the time spent, which includes the 'priority'
var breakdown = timeSpent.getLatest().breakdown();
//Convert the priority timings to % of total time
breakdown = breakdown.get("priority").asPercentage();
//Filter the highest priority
breakdown = breakdown.filter("Critical", "High");
//Return the total % time spent on highest priority issues
'value' : breakdown.sum()