Each point of data for a metric or a KPI can contain metadata, a breakdown of the value by one or more labels. For example, a count of open issues might be broken down by Issue Type and by Issue Severity. This collection of one or more breakdown is represented by a BreakdownSet object.
The breakdown of a metric is determined by the breakdown configuration property of its connection or its own Collection Configuration property as illustrated above. In this example the collected metric Facts will contain breakdown metadata for Component, Priority and Resolution. This set of three breakdowns is the metrics BreakdownSet.