functions/Copy-DbaAgentAlert.ps1

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
            Login to the target instance using alternative credentials. Windows and SQL Authentication supported. Accepts credential objects (Get-Credential)
 
        .PARAMETER Destination
            Destination SQL Server. You must have sysadmin access and the server must be SQL Server 2000 or higher.
 
        .PARAMETER DestinationSqlCredential
            Login to the target instance using alternative credentials. Windows and SQL Authentication supported. Accepts credential objects (Get-Credential)
 
        .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: MIT https://opensource.org/licenses/MIT
 
        .LINK
            https://dbatools.io/Copy-DbaAgentAlert
 
        .EXAMPLE
            PS C:\> 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
            PS C:\> 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
            PS C:\> Copy-DbaAgentAlert -Source sqlserver2014a -Destination sqlcluster -WhatIf -Force
 
            Shows what would happen if the command were executed using force.
    #>

    [cmdletbinding(DefaultParameterSetName = "Default", SupportsShouldProcess = $true)]
    param (
        [parameter(Mandatory)]
        [DbaInstanceParameter]$Source,
        [PSCredential]$SourceSqlCredential,
        [parameter(Mandatory)]
        [DbaInstanceParameter[]]$Destination,
        [PSCredential]$DestinationSqlCredential,
        [object[]]$Alert,
        [object[]]$ExcludeAlert,
        [switch]$IncludeDefaults,
        [switch]$Force,
        [Alias('Silent')]
        [switch]$EnableException
    )
    begin {
        try {
            Write-Message -Level Verbose -Message "Connecting to $Source"
            $sourceServer = Connect-SqlInstance -SqlInstance $Source -SqlCredential $SourceSqlCredential
            $serverAlerts = $sourceServer.JobServer.Alerts
        }
        catch {
            Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $Source
            return
        }
    }
    process {
        if (Test-FunctionInterrupt) { return }
        foreach ($destinstance in $Destination) {
            try {
                Write-Message -Level Verbose -Message "Connecting to $destinstance"
                $destServer = Connect-SqlInstance -SqlInstance $destinstance -SqlCredential $DestinationSqlCredential
            }
            catch {
                Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $destinstance -Continue
            }
            $destAlerts = $destServer.JobServer.Alerts

            if ($IncludeDefaults -eq $true) {
                if ($PSCmdlet.ShouldProcess($destinstance, "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'"), "'$destinstance'"

                        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 -ErrorRecord $_ -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 $false) {
                        if ($PSCmdlet.ShouldProcess($destinstance, "Alert [$alertName] exists at destination. Use -Force to drop and migrate.")) {
                            $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 ($PSCmdlet.ShouldProcess($destinstance, "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)
                            $destAlerts.Refresh()
                        }
                        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 -ErrorRecord $_ -Target $destServer -Continue
                        }
                    }
                }

                if ($destAlerts | Where-Object { $_.Severity -eq $serverAlert.Severity -and $_.MessageID -eq $serverAlert.MessageID -and $_.DatabaseName -eq $serverAlert.DatabaseName -and $_.EventDescriptionKeyword -eq $serverAlert.EventDescriptionKeyword }) {
                    if ($PSCmdlet.ShouldProcess($destinstance, "Checking for conflicts")) {
                        $conflictMessage = "Alert [$alertName] has already been defined to use"
                        if ($serverAlert.Severity -gt 0) { $conflictMessage += " severity $($serverAlert.Severity)" }
                        if ($serverAlert.MessageID -gt 0) { $conflictMessage += " error number $($serverAlert.MessageID)" }
                        if ($serverAlert.DatabaseName) { $conflictMessage += " on database '$($serverAlert.DatabaseName)'" }
                        if ($serverAlert.EventDescriptionKeyword) { $conflictMessage += " with error text '$($serverAlert.Severity)'" }
                        $conflictMessage += ". Skipping."

                        Write-Message -Level Verbose -Message $conflictMessage
                        $copyAgentAlertStatus.Status = "Skipped"
                        $copyAgentAlertStatus.Notes = $conflictMessage
                        $copyAgentAlertStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                    }
                    continue
                }
                if ($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 $destServer. Skipping."
                    if ($PSCmdlet.ShouldProcess($destinstance, "Checking for conflicts")) {
                        $copyAgentAlertStatus.Status = "Skipped"
                        $copyAgentAlertStatus | Select-DefaultView -Property DateTime, SourceServer, DestinationServer, Name, Type, Status, Notes -TypeName MigrationObject
                    }
                    continue
                }

                if ($PSCmdlet.ShouldProcess($destinstance, "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 -ErrorRecord $_ -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($destinstance, "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 -ErrorRecord $_ -Target $destServer
                        }
                    }
                }

                if ($PSCmdlet.ShouldProcess($destinstance, "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 -ErrorRecord $_ -Target $destServer
                    }
                }
            }
        }
    }
    end {
        Test-DbaDeprecation -DeprecatedOn "1.0.0" -EnableException:$false -Alias Copy-SqlAlert
    }
}