#ログファイルのパスとインターバルは適宜変更してください。
$logpath = "C:\perflogs\Admin\Hyper-VHostLog\*.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
    }
  }
}

$perfcounters = @(
  "Hyper-V Hypervisor Logical Processor(*)\% Total Run Time",
  "Hyper-V Hypervisor Virtual Processor(*)\% Total Run Time",
  "Hyper-V Hypervisor Root Virtual Processor(*)\% Total Run Time"
  "Processor(*)\% DPC Time",
  "Processor(*)\% Interrupt Time",
  "Memory\Available MBytes",
  "Hyper-V Dynamic Memory Balancer(*)\Available Memory",
  "Network Interface(*)\Bytes Total/sec",
  "Network Interface(*)\Output Queue Length",
  "Hyper-V Virtual Network Adapter(*)\Bytes/sec",
  "PhysicalDisk(*)\Avg. Disk sec/Read",
  "PhysicalDisk(*\Avg. Disk sec/Write",
  "PhysicalDisk(*)\Avg. Disk Read Queue Length",
  "PhysicalDisk(*)\Avg. Disk Write Queue Length"  
)

foreach ($perfcounter in $perfcounters) {
  $usage = $counters | Where-Object Path -like "*$perfcounter*"
  $result = $usage |
    Group-Object InstanceName |
    ForEach-Object {
        $values = $_.Group.CookedValue

        [PSCustomObject]@{
            # Instance = $_.Name
            # Remove GUID for Hyper-V Virtual Network Adapter
            Instance = ($_.Name -replace "_[0-9a-f\-]{36}.*$", "" ) -replace "_\d+__device_\{[0-9a-f\-]+\}.*$", ""
            Avg      = [Math]::Round(($values | Measure-Object -Average).Average,2)
            Max      = [Math]::Round(($values | Measure-Object -Maximum).Maximum,2)
            Min      = [Math]::Round(($values | Measure-Object -Minimum).Minimum,2)
        }
    }
  $perfcounter
  $result | Format-Table -AutoSize
}