tests/Test-HostIISLogFiles.ps1

function Test-HostIISLogFiles {
    [CmdletBinding()]
    param (
        [parameter()][string] $TestName = "IIS Log Files",
        [parameter()][string] $TestGroup = "configuration",
        [parameter()][string] $TestCategory = "HOST",
        [parameter()][string] $Description = "Validate IIS Log File retention",
        [parameter()][hashtable] $ScriptParams
    )
    try {
        $startTime = (Get-Date)
        [int]$MaxDaysOld  = Get-CmHealthDefaultValue -KeySet "iis:LogFilesMaxDaysOld" -DataSet $CmHealthConfig
        [int]$MaxSpacePct = Get-CmHealthDefaultValue -KeySet "iis:LogFilesMaxSpacePercent" -DataSet $CmHealthConfig
        Write-Log -Message "MaxDaysOld = $MaxDaysOld"
        Write-Log -Message "MaxSpacePct = $MaxSpacePct"

        $stat   = "PASS"
        $except = "WARNING"
        $msg    = "No issues found"

        [System.Collections.Generic.List[PSObject]]$tempdata = @() # for detailed test output to return if needed

        if (!(Get-Module WebAdministration -ListAvailable)) { throw "WebAdministration module not installed. Please install RSAT" }
        Import-Module WebAdministration
        $LogsBase = $(Get-Item 'IIS:\Sites\Default Web Site').logfile.directory -replace '%SystemDrive%', "$($env:SYSTEMDRIVE)"
        $IISLogsPath = Join-Path $LogsBase -ChildPath "W3SVC1"
        #$IISLogsDrive = Split-Path $IISLogsPath -Qualifier
        
        #$disksize = $(Get-WmiQueryResult -ClassName 'Win32_LogicalDisk' -Filter "DeviceID = '$IISLogsDrive'" | Select-Object -ExpandProperty Size
        #$disksizeMB = $disksize / 1MB
        #$disksizeGB = $disksize / 1GB
        
        $logs = Get-ChildItem -Path $IISLogsPath -Filter "*.log"
        #$logspace = $logs | Measure-Object -Property Length -Sum | Select-Object -ExpandProperty Sum
        #$logspaceGB = $logspace / 1GB

        $OldLogs = @($logs | Where-Object { $_.LastWriteTime -lt (Get-Date).AddDays(-$MaxDaysOld) })

        if ($OldLogs.Count -gt 0) {
            Write-Log -Message "$($oldLogs.Count) older log files were found"
            $stat = $except
            $msg  = "$($OldLogs.Count) of $numlogs IIS logs older than $MaxDaysOld days old"
        }
        $tempdata.Add([pscustomobject]@{
            Status  = $stat
            Message = $msg
            Note    = "Path = $IISLogsPath"
        })
    }
    catch {
        $stat = 'ERROR'
        $msg = $_.Exception.Message -join ';'
    }
    finally {
        Set-CmhOutputData
    }
}