Get all Monitors and Overrides for a Management Pack

For monitors, you use this command: get-monitor -managementPack name.mp | export-csv filename

For example, this command gets the monitors associated with one of the core Management Packs:
get-monitor -managementPack System.Health.Library.mp | export-csv "C:\monitors.csv"

For overrides: get-override -managementPack name.mp | export-csv filename

For example, this command:
get-override -managementPack Microsoft.SystemCenter.OperationsManager.Internal.mp | export-csv "c:\overrides.csv"