While the Get-Metric cmdlet could potentially be very useful, at the moment it is imho useless.
The cmdlet is apparently missing the Rollup parameter.
For example, when one does
Get-Metric -MetricGroup 'CPU' -Name 'usage'
4 objects are returned.
I know these correspond with the 4 Rollup values for this metric: average, minimum, maximum and none
- there is no Rollup parameter
- the output does not contain the Rollup value