$logpath = Get-ChildItem "C:\PerfLogs\Admin\ServerManager\*.blg"
$intervalhr = 24
$since = (Get-Date).AddHours(-1*$intervalhr)
$logs = Get-ChildItem $logpath |
    Where-Object { $_.LastWriteTime -ge $since } |
    Sort-Object LastWriteTime -Descending
$counters = @()
foreach ($log in $logs) {
  $ret = $null
  if((get-item($log)).Length -gt 131072) {
    $ret = Import-Counter -Path $log.FullName -ErrorAction SilentlyContinue | Where-Object { $_.TimeStamp -ge $since } | Select-Object -Expand CounterSamples
    if ($ret -and $ret.Count -gt 0) {
      $counters += $ret
    }
  }
}
if ($counters) {
  $cpuusage = $counters | Where-Object { $_.Path -like "*Processor(_Total)\% Processor Time*"}
$result = $cpuusage | Group-Object {
    $_.Timestamp.ToString("yyyy-MM-dd HH:")
  } | ForEach-Object {

    $values = $_.Group.CookedValue
    $avg = ($values | Measure-Object -Average).Average
    $max = ($values | Measure-Object -Maximum).Maximum
    $min = ($values | Measure-Object -Minimum).Minimum
    [PSCustomObject]@{
        Hour = $_.Name
        Avg  = [math]::Round($avg,2)
        Max  = [math]::Round($max,2)
        Min  = [math]::Round($min,2)
    }
  }
  $result | Sort-Object Hour| Format-Table Hour, Avg, Max, Min -AutoSize
  [PSCustomObject]@{
    Avg_Avg = [math]::Round(($result | Measure-Object Avg -Average).Average,2)
    Max_Avg = [math]::Round(($result | Measure-Object Max -Average).Average,2)
    Min_Avg = [math]::Round(($result | Measure-Object Min -Average).Average,2)
  }
} else {
    Write-Host "No performance data in logs."
}