functions/Get-DbaAgentLog.ps1

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function Get-DbaAgentLog {
<#
 .SYNOPSIS
  Gets the "SQL Agent Error Log" of an instance
  
 .DESCRIPTION
  Gets the "SQL Agent Error Log" of an instance. Returns all 10 error logs by default.
 
 .PARAMETER SqlInstance
  The SQL Server instance, or instances.
  
 .PARAMETER SqlCredential
  Allows you to login to servers using SQL Logins as opposed to Windows Auth/Integrated/Trusted.
  
 .PARAMETER LogNumber
  An Int32 value that specifies the index number of the error log required. Error logs are listed 0 through 9 where 0 is the current error log and 9 is the oldest.
  
 .PARAMETER Silent
  Use this switch to disable any kind of verbose messages
  
 .NOTES
  Tags: Logging
  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-DbaAgentLog
  
 .EXAMPLE
  Get-DbaAgentLog -SqlInstance sql01\sharepoint
   
  Returns the entire error log for the SQL Agent on sql01\sharepoint
 
 .EXAMPLE
  Get-DbaAgentLog -SqlInstance sql01\sharepoint -LogNumber 3, 6
   
  Returns log numbers 3 and 6 for the SQL Agent on sql01\sharepoint
  
 .EXAMPLE
  $servers = "sql2014","sql2016", "sqlcluster\sharepoint"
  $servers | Get-DbaAgentLog -LogNumber 0
   
  Returns the most recent SQL Agent error logs for "sql2014","sql2016" and "sqlcluster\sharepoint"
 
#>
    
    [CmdletBinding()]
    param (
        [Parameter(ValueFromPipeline = $true)]
        [Alias("ServerInstance", "SqlServer")]
        [DbaInstanceParameter[]]$SqlInstance,
        [Alias("Credential")]
        [PSCredential]
        $SqlCredential,
        [ValidateRange(0, 9)]
        [int[]]$LogNumber,
        [switch]$Silent
    )
    process {
        foreach ($instance in $SqlInstance) {
            Write-Message -Level Verbose -Message "Attempting to connect to $instance"
            
            try {
                $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $SqlCredential
            }
            catch {
                Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue
            }
            
            if ($LogNumber) {
                foreach ($number in $lognumber) {
                    try {
                    foreach ($object in $server.JobServer.ReadErrorLog($number)) {
                        Write-Message -Level Verbose -Message "Processing $object"
                        Add-Member -Force -InputObject $object -MemberType NoteProperty ComputerName -value $server.NetName
                        Add-Member -Force -InputObject $object -MemberType NoteProperty InstanceName -value $server.ServiceName
                        Add-Member -Force -InputObject $object -MemberType NoteProperty SqlInstance -value $server.DomainInstanceName
                        
                        # Select all of the columns you'd like to show
                        Select-DefaultView -InputObject $object -Property ComputerName, InstanceName, SqlInstance, LogDate, ProcessInfo, Text
                        }
                    }
                    catch {
                        Stop-Function -Continue -Target $server -Message "Could not read from SQL Server Agent"
                    }
                }
            }
            else {
                try {
                    foreach ($object in $server.JobServer.ReadErrorLog()) {
                        Write-Message -Level Verbose -Message "Processing $object"
                        Add-Member -Force -InputObject $object -MemberType NoteProperty ComputerName -value $server.NetName
                        Add-Member -Force -InputObject $object -MemberType NoteProperty InstanceName -value $server.ServiceName
                        Add-Member -Force -InputObject $object -MemberType NoteProperty SqlInstance -value $server.DomainInstanceName
                        
                        # Select all of the columns you'd like to show
                        Select-DefaultView -InputObject $object -Property ComputerName, InstanceName, SqlInstance, LogDate, ProcessInfo, Text
                    }
                }
                catch {
                    Stop-Function -Continue -Target $server -Message "Could not read from SQL Server Agent"
                }
            }
        }
    }
}