functions/Get-DbaRgResourcePool.ps1

function Get-DbaRgResourcePool {
    <#
        .SYNOPSIS
            Gets Resource Governor Pool objects, including internal or external
 
        .DESCRIPTION
            Gets Resource Governor Pool objects, including internal or external
 
        .PARAMETER SqlInstance
            The target SQL Server instance(s)
 
        .PARAMETER SqlCredential
            Allows you to login to SQL Server using alternative credentials
 
        .PARAMETER InputObject
            Allows input to be piped from Get-DbaResourceGovernor
 
        .PARAMETER Type
            Internal or External
 
        .PARAMETER EnableException
            By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message.
            This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting.
            Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch.
 
        .NOTES
            Tags: ResourceGovernor
            Author: Chrissy LeMaire (@cl), netnerds.net
 
            Website: https://dbatools.io
            Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
            License: MIT https://opensource.org/licenses/MIT
 
        .LINK
            https://dbatools.io/Get-DbaRgResourcePool
 
        .EXAMPLE
            PS C:\> Get-DbaRgResourcePool -SqlInstance sql2016
 
            Gets the internal resource pools on sql2016
 
        .EXAMPLE
            PS C:\> 'Sql1','Sql2/sqlexpress' | Get-DbaResourceGovernor | Get-DbaRgResourcePool
 
            Gets the internal resource pools on Sql1 and Sql2/sqlexpress instances
 
        .EXAMPLE
            PS C:\> 'Sql1','Sql2/sqlexpress' | Get-DbaResourceGovernor | Get-DbaRgResourcePool -Type External
 
            Gets the external resource pools on Sql1 and Sql2/sqlexpress instances
 
    #>

    [CmdletBinding()]
    param (
        [Parameter(ValueFromPipeline)]
        [DbaInstanceParameter[]]$SqlInstance,
        [PSCredential]$SqlCredential,
        [ValidateSet("Internal", "External")]
        [string]$Type = "Internal",
        [parameter(ValueFromPipeline)]
        [Microsoft.SqlServer.Management.Smo.ResourceGovernor[]]$InputObject,
        [switch]$EnableException
    )

    process {
        foreach ($instance in $SqlInstance) {
            Write-Message -Level Verbose -Message "Connecting to $instance"
            $InputObject += Get-DbaResourceGovernor -SqlInstance $SqlInstance -SqlCredential $SqlCredential
        }

        foreach ($resourcegov in $InputObject) {
            if ($Type -eq "External") {
                $respool = $resourcegov.ExternalResourcePools
                if ($respool) {
                    $respool | Add-Member -Force -MemberType NoteProperty -Name ComputerName -value $resourcegov.ComputerName
                    $respool | Add-Member -Force -MemberType NoteProperty -Name InstanceName -value $resourcegov.InstanceName
                    $respool | Add-Member -Force -MemberType NoteProperty -Name SqlInstance -value $resourcegov.SqlInstance
                    $respool | Select-DefaultView -Property ComputerName, InstanceName, SqlInstance, Id, Name, CapCpuPercentage, IsSystemObject, MaximumCpuPercentage, MaximumIopsPerVolume, MaximumMemoryPercentage, MinimumCpuPercentage, MinimumIopsPerVolume, MinimumMemoryPercentage, WorkloadGroups
                }
            }
            else {
                $respool = $resourcegov.ResourcePools
                if ($respool) {
                    $respool | Add-Member -Force -MemberType NoteProperty -Name ComputerName -value $resourcegov.ComputerName
                    $respool | Add-Member -Force -MemberType NoteProperty -Name InstanceName -value $resourcegov.InstanceName
                    $respool | Add-Member -Force -MemberType NoteProperty -Name SqlInstance -value $resourcegov.SqlInstance
                    $respool | Select-DefaultView -Property ComputerName, InstanceName, SqlInstance, Id, Name, CapCpuPercentage, IsSystemObject, MaximumCpuPercentage, MaximumIopsPerVolume, MaximumMemoryPercentage, MinimumCpuPercentage, MinimumIopsPerVolume, MinimumMemoryPercentage, WorkloadGroups
                }
            }
        }
    }
}