functions/Add-DbaDbMirrorMonitor.ps1

#ValidationTags#Messaging,FlowControl,Pipeline,CodeStyle#
function Add-DbaDbMirrorMonitor {
 <#
    .SYNOPSIS
            Creates a database mirroring monitor job that periodically updates the mirroring status for every mirrored database on the server instance.
     
    .DESCRIPTION
            Creates a database mirroring monitor job that periodically updates the mirroring status for every mirrored database on the server instance.
     
            Basically executes sp_dbmmonitoraddmonitoring.
     
    .PARAMETER SqlInstance
            The target SQL Server instance
     
    .PARAMETER SqlCredential
            Login to the target instance using alternate Windows or SQL Login Authentication. Accepts credential objects (Get-Credential).
 
    .PARAMETER WhatIf
            Shows what would happen if the command were to run. No actions are actually performed.
 
    .PARAMETER Confirm
            Prompts you for confirmation before executing any changing operations within the command.
     
    .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
            Author: Chrissy LeMaire (@cl), netnerds.net
            Website: https://dbatools.io
            Copyright (c) 2018 by dbatools, licensed under MIT
- License: MIT https://opensource.org/licenses/MIT
     
        .LINK
            https://dbatools.io/Add-DbaDbMirrorMonitor
     
        .EXAMPLE
            PS C:\> Add-DbaDbMirrorMonitor -SqlInstance sql2008, sql2012
             
            Creates a database mirroring monitor job that periodically updates the mirroring status for every mirrored database on sql2008 and sql2012.
#>

    [CmdletBinding(SupportsShouldProcess, ConfirmImpact = 'Low')]
    Param (
        [parameter(Mandatory, ValueFromPipeline)]
        [DbaInstanceParameter[]]$SqlInstance,
        [PSCredential]$SqlCredential,
        [switch]$EnableException
    )
    process {
        foreach ($instance in $SqlInstance) {
            try {
                $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $SqlCredential -MinimumVersion 9
            }
            catch {
                Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue
            }
            
            if ($Pscmdlet.ShouldProcess($instance, "add mirror monitoring")) {
                try {
                    $server.Query("msdb.dbo.sp_dbmmonitoraddmonitoring")
                    [pscustomobject]@{
                        ComputerName = $server.ComputerName
                        InstanceName = $server.ServiceName
                        SqlInstance  = $server.DomainInstanceName
                        MonitorStatus = "Added"
                    }
                }
                catch {
                    Stop-Function -Message "Failure" -ErrorRecord $_ -Continue
                }
            }
        }
    }
}