Return one or more named breakdown metadata for all metrics or KPIs in the argument, merging all metadata into a single BreakdownSet. 

This is a convenience method most applicable when a single metric or a single kpi is used in the calculation. Because the input metric and KPI data is normally for a collection of dates and times calling this function without first filtering the argument for the desired date will result in all dates being merged together.

var breakdown = metrics.latest().breakdown('product'); 

In the above example the metrics are first filtered to only contain the last known data point and then the product breakdown is merged and returned. If a single metric is input to the formula the above would be equivalent to calling:

var breakdown = metrics.getLatest('...').breakdown('product'); 

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