functions/Get-DbaAgHadr.ps1

function Get-DbaAgHadr {
    <#
        .SYNOPSIS
            Gets the Hadr service setting on the specified SQL Server instance.
 
        .DESCRIPTION
            Gets the Hadr setting, from the service level, and returns true or false for the specified SQL Server instance.
 
        .PARAMETER SqlInstance
            The SQL Server that you're connecting to.
 
        .PARAMETER Credential
            Credential object used to connect to the Windows server itself as a different user
 
        .PARAMETER Silent
            Use this switch to disable any kind of verbose messages
 
        .NOTES
            Original Author: Shawn Melton (@wsmelton | http://blog.wsmelton.info)
 
            Website: https://dbatools.io
            Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
            License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0
 
        .LINK
            https://dbatools.io/Get-DbaAgHadr
 
        .EXAMPLE
            Get-DbaAgHadr -SqlInstance sql2016
 
            Returns a status of the Hadr setting for sql2016 SQL Server instance.
    #>

    [CmdletBinding()]
    param (
        [parameter(Mandatory = $true, ValueFromPipeline = $true)]
        [Alias("ServerInstance", "SqlServer")]
        [DbaInstanceParameter[]]$SqlInstance,
        [PSCredential]$Credential,
        [switch]$Silent
    )
    process {
        foreach ($instance in $SqlInstance) {

            try {
                $computer = $instance.ComputerName
                $instanceName = $instance.InstanceName
                $computerName = (Resolve-DbaNetworkName -ComputerName $computer -Credential $Credential).FullComputerName
                Write-Message -Level Verbose -Message "Attempting to connect to $computer"
                $currentState = Invoke-ManagedComputerCommand -ComputerName $computerName -ScriptBlock { $wmi.Services[$args[0]] | Select-Object IsHadrEnabled } -ArgumentList $instanceName -Credential $Credential
            }
            catch {
                Stop-Function -Message "Failure connecting to $computer" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue
            }
            [PSCustomObject]@{
                ComputerName = $computerName
                InstanceName = $instanceName
                SqlInstance = $instance.FullName
                IsHadrEnabled = $currentState.IsHadrEnabled
            }
        }
    }
}