This table contains historic IP CBR metrics for the traffic
flows monitored by each of the flow monitors supported by the
device.
This table has an sparse dependent relationship on the
cfmFlowMetricsIntTable (defined by the CISCO-FLOW-MONITOR-MIB),
containing a row for each row in the cfmFlowMetricsIntTable
having a corresponding instance of cfmFlowMetricsCollected with
the 'ipCbr' bit set to one.