functions/Copy-DbaAgentAlert.ps1

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function Copy-DbaAgentAlert {
    <#
  .SYNOPSIS
   Copy-DbaAgentAlert migrates alerts from one SQL Server to another.
 
  .DESCRIPTION
   By default, all alerts are copied. The -Alert parameter is auto-populated for command-line completion and can be used to copy only specific alerts.
 
   If the alert already exists on the destination, it will be skipped unless -Force is used.
 
  .PARAMETER Source
   Source SQL Server. You must have sysadmin access and server version must be SQL Server version 2000 or higher.
 
  .PARAMETER SourceSqlCredential
   Allows you to login to servers using SQL Logins instead of Windows Authentication (AKA Integrated or Trusted). To use:
 
   $scred = Get-Credential, then pass $scred object to the -SourceSqlCredential parameter.
 
   Windows Authentication will be used if SourceSqlCredential is not specified. SQL Server does not accept Windows credentials being passed as credentials.
 
   To connect as a different Windows user, run PowerShell as that user.
 
  .PARAMETER Destination
   Destination SQL Server. You must have sysadmin access and the server must be SQL Server 2000 or higher.
 
  .PARAMETER DestinationSqlCredential
   Allows you to login to servers using SQL Logins instead of Windows Authentication (AKA Integrated or Trusted). To use:
 
   $dcred = Get-Credential, then pass this $dcred to the -DestinationSqlCredential parameter.
 
   Windows Authentication will be used if DestinationSqlCredential is not specified. SQL Server does not accept Windows credentials being passed as credentials.
 
   To connect as a different Windows user, run PowerShell as that user.
 
  .PARAMETER Alert
   The alert(s) to process. This list is auto-populated from the server. If unspecified, all alerts will be processed.
 
  .PARAMETER ExcludeAlert
   The alert(s) to exclude. This list is auto-populated from the server.
 
  .PARAMETER IncludeDefaults
   Copy SQL Agent defaults such as FailSafeEmailAddress, ForwardingServer, and PagerSubjectTemplate.
 
  .PARAMETER WhatIf
   If this switch is enabled, no actions are performed but informational messages will be displayed that explain what would happen if the command were to run.
 
  .PARAMETER Confirm
   If this switch is enabled, you will be prompted for confirmation before executing any operations that change state.
 
  .PARAMETER Force
   If this switch is enabled, the Alert will be dropped and recreated on Destination.
 
  .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: Migration, Agent
   Author: Chrissy LeMaire (@cl), netnerds.net
   Requires: sysadmin access on SQL Servers
 
   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/Copy-DbaAgentAlert
 
  .EXAMPLE
   Copy-DbaAgentAlert -Source sqlserver2014a -Destination sqlcluster
 
   Copies all alerts from sqlserver2014a to sqlcluster using Windows credentials. If alerts with the same name exist on sqlcluster, they will be skipped.
 
  .EXAMPLE
   Copy-DbaAgentAlert -Source sqlserver2014a -Destination sqlcluster -Alert PSAlert -SourceSqlCredential $cred -Force
 
   Copies a only the alert named PSAlert from sqlserver2014a to sqlcluster using SQL credentials for sqlserver2014a and Windows credentials for sqlcluster. If a alert with the same name exists on sqlcluster, it will be dropped and recreated because -Force was used.
 
  .EXAMPLE
   Copy-DbaAgentAlert -Source sqlserver2014a -Destination sqlcluster -WhatIf -Force
 
   Shows what would happen if the command were executed using force.
 #>

    [cmdletbinding(DefaultParameterSetName = "Default", SupportsShouldProcess = $true)]
    param (
        [parameter(Mandatory = $true)]
        [DbaInstanceParameter]$Source,
        [PSCredential]
        $SourceSqlCredential,
        [parameter(Mandatory = $true)]
        [DbaInstanceParameter]$Destination,
        [PSCredential]
        $DestinationSqlCredential,
        [object[]]$Alert,
        [object[]]$ExcludeAlert,
        [switch]$IncludeDefaults,
        [switch]$Force,
        [switch][Alias('Silent')]$EnableException
    )

    begin {
        $sourceServer = Connect-SqlInstance -SqlInstance $Source -SqlCredential $SourceSqlCredential
        $destServer = Connect-SqlInstance -SqlInstance $Destination -SqlCredential $DestinationSqlCredential

        $source = $sourceServer.DomainInstanceName
        $Destination = $destServer.DomainInstanceName

    }
    process {

        $serverAlerts = $sourceServer.JobServer.Alerts
        $destAlerts = $destServer.JobServer.Alerts

        if ($IncludeDefaults -eq $true) {
            if ($PSCmdlet.ShouldProcess($Destination, "Creating Alert Defaults")) {
                $copyAgentAlertStatus = [pscustomobject]@{
                    SourceServer       = $sourceServer.Name
                    DestinationServer  = $destServer.Name
                    Name               = "Alert Defaults"
                    Type               = "Alert Defaults"
                    Status               = $null
                    Notes               = $null
                    DateTime           = [Sqlcollaborative.Dbatools.Utility.DbaDateTime](Get-Date)
                }
                try {
                    Write-Message -Message "Creating Alert Defaults" -Level Verbose
                    $sql = $sourceServer.JobServer.AlertSystem.Script() | Out-String
                    $sql = $sql -replace [Regex]::Escape("'$source'"), "'$Destination'"

                    Write-Message -Message $sql -Level Debug
                    $null = $destServer.Query($sql)

                    $copyAgentAlertStatus.Status = "Successful"
                }
                catch {
                    $copyAgentAlertStatus.Status = "Failed"
                    $copyAgentAlertStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                    Stop-Function -Message "Issue creating alert defaults." -Category InvalidOperation -InnerErrorRecord $_ -Target $destServer -Continue
                }
                $copyAgentAlertStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
            }
        }

        foreach ($serverAlert in $serverAlerts) {
            $alertName = $serverAlert.name
            $copyAgentAlertStatus = [pscustomobject]@{
                SourceServer      = $sourceServer.Name
                DestinationServer = $destServer.Name
                Name              = $alertName
                Type              = "Agent Alert"
                Notes              = $null
                Status            = $null
                DateTime          = [Sqlcollaborative.Dbatools.Utility.DbaDateTime](Get-Date)
            }

            if (($Alert -and $Alert -notcontains $alertName) -or ($ExcludeAlert -and $ExcludeAlert -contains $alertName)) {
                continue
            }

            if ($destAlerts.name -contains $serverAlert.name) {
                if ($force -eq $false) {
                    $copyAgentAlertStatus.Status = "Skipped"
                    $copyAgentAlertStatus.Notes = "Already exists"
                    $copyAgentAlertStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                    Write-Message -Message "Alert [$alertName] exists at destination. Use -Force to drop and migrate." -Level Verbose
                    continue
                }

                if ($PSCmdlet.ShouldProcess($Destination, "Dropping alert $alertName and recreating")) {
                    try {
                        Write-Message -Message "Dropping Alert $alertName on $destServer." -Level Verbose

                        $sql = "EXEC msdb.dbo.sp_delete_alert @name = N'$($alertname)';"
                        Write-Message -Message $sql -Level Debug
                        $null = $destServer.Query($sql)
                    }
                    catch {
                        $copyAgentAlertStatus.Status = "Failed"
                        $copyAgentAlertStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                        Stop-Function -Message "Issue dropping/recreating alert" -Category InvalidOperation -InnerErrorRecord $_ -Target $destServer -Continue
                    }
                }
            }

            $destSevConflict = $destAlerts | Where-Object Severity -eq $serverAlert.Severity
            $destSevDbConflict = $destAlerts | Where-Object { $_.Severity -eq $serverAlert.Severity -and $_.DatabaseName -eq $serverAlert.DatabaseName }
            if ($destSevConflict) {
                Write-Message -Level Verbose -Message "Alert [$($destSevConflict.Name)] has already been defined to use the severity $($serverAlert.Severity). Skipping."
                
                $copyAgentAlertStatus.Status = "Skipped"
                $copyAgentAlertStatus.Notes = "Already defined"
                $copyAgentAlertStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                continue
            }
            if ($destSevDbConflict) {
                Write-Message -Level Verbose -Message "Alert [$($destSevConflict.Name)] has already been defined to use the severity $($serverAlert.Severity) on database $($severAlert.DatabaseName). Skipping."

                $copyAgentAlertStatus.Status = "Skipped"
                $copyAgentAlertStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                continue
            }

            if ($serverAlert.JobName -and $destServer.JobServer.Jobs.Name -NotContains $serverAlert.JobName) {
                Write-Message -Level Verbose -Message "Alert [$alertName] has job [$($serverAlert.JobName)] configured as response. The job does not exist on destination $destServer. Skipping."

                $copyAgentAlertStatus.Status = "Skipped"
                $copyAgentAlertStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                continue
            }

            if ($PSCmdlet.ShouldProcess($Destination, "Creating Alert $alertName")) {
                try {
                    Write-Message -Message "Copying Alert $alertName" -Level Verbose
                    $sql = $serverAlert.Script() | Out-String
                    $sql = $sql -replace "@job_id=N'........-....-....-....-............", "@job_id=N'00000000-0000-0000-0000-000000000000"

                    Write-Message -Message $sql -Level Debug
                    $null = $destServer.Query($sql)

                    $copyAgentAlertStatus.Status = "Successful"
                    $copyAgentAlertStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                }
                catch {
                    $copyAgentAlertStatus.Status = "Failed"
                    $copyAgentAlertStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                    Stop-Function -Message "Issue creating alert" -Category InvalidOperation -InnerErrorRecord $_ -Target $destServer -Continue
                }
            }

            $destServer.JobServer.Alerts.Refresh()
            $destServer.JobServer.Jobs.Refresh()

            $newAlert = $destServer.JobServer.Alerts[$alertName]
            $notifications = $serverAlert.EnumNotifications()
            $jobName = $serverAlert.JobName

            # JobId = 00000000-0000-0000-0000-000 means the Alert does not execute/is attached to a SQL Agent Job.
            if ($serverAlert.JobId -ne '00000000-0000-0000-0000-000000000000') {
                $copyAgentAlertStatus = [pscustomobject]@{
                    SourceServer      = $sourceServer.Name
                    DestinationServer = $destServer.Name
                    Name              = $alertName
                    Type               = "Agent Alert Job Association"
                    Notes               = "Associated with $jobName"
                    Status            = $null
                    DateTime          = [Sqlcollaborative.Dbatools.Utility.DbaDateTime](Get-Date)
                }
                if ($PSCmdlet.ShouldProcess($Destination, "Adding $alertName to $jobName")) {
                    try {
                        <# THERE needs to be validation within this block to see if the $jobName actually exists on the source server. #>
                        Write-Message -Message "Adding $alertName to $jobName" -Level Verbose
                        $newJob = $destServer.JobServer.Jobs[$jobName]
                        $newJobId = ($newJob.JobId) -replace " ", ""
                        $sql = $sql -replace '00000000-0000-0000-0000-000000000000', $newJobId
                        $sql = $sql -replace 'sp_add_alert', 'sp_update_alert'

                        Write-Message -Message $sql -Level Debug
                        $null = $destServer.Query($sql)

                        $copyAgentAlertStatus.Status = "Successful"
                        $copyAgentAlertStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                    }
                    catch {
                        $copyAgentAlertStatus.Status = "Failed"
                        $copyAgentAlertStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                        Stop-Function -Message "Issue adding alert to job" -Category InvalidOperation -InnerErrorRecord $_ -Target $destServer
                    }
                }
            }

            if ($PSCmdlet.ShouldProcess($Destination, "Moving Notifications $alertName")) {
                try {
                    $copyAgentAlertStatus = [pscustomobject]@{
                        SourceServer       = $sourceServer.Name
                        DestinationServer  = $destServer.Name
                        Name               = $alertName
                        Type               = "Agent Alert Notification"
                        Notes               = $null
                        Status               = $null
                        DateTime           = [Sqlcollaborative.Dbatools.Utility.DbaDateTime](Get-Date)
                    }
                    # cant add them this way, we need to modify the existing one or give all options that are supported.
                    foreach ($notify in $notifications) {
                        $notifyCollection = @()
                        if ($notify.UseNetSend -eq $true) {
                            Write-Message -Message "Adding net send" -Level Verbose
                            $notifyCollection += "NetSend"
                        }

                        if ($notify.UseEmail -eq $true) {
                            Write-Message -Message "Adding email" -Level Verbose
                            $notifyCollection += "NotifyEmail"
                        }

                        if ($notify.UsePager -eq $true) {
                            Write-Message -Message "Adding pager" -Level Verbose
                            $notifyCollection += "Pager"
                        }

                        $notifyMethods = $notifyCollection -join ", "
                        $newAlert.AddNotification($notify.OperatorName, [Microsoft.SqlServer.Management.Smo.Agent.NotifyMethods]$notifyMethods)
                    }
                    $copyAgentAlertStatus.Status = "Successful"
                    $copyAgentAlertStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                }
                catch {
                    $copyAgentAlertStatus.Status = "Failed"
                    $copyAgentAlertStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                    Stop-Function -Message "Issue moving notifications for the alert" -Category InvalidOperation -InnerErrorRecord $_ -Target $destServer
                }
            }
        }
    }
    end {
        Test-DbaDeprecation -DeprecatedOn "1.0.0" -EnableException:$false -Alias Copy-SqlAlert
    }
}