$last2rel = Get-CimInstance -ClassName Win32_ReliabilityStabilityMetrics |
    Sort-Object TimeGenerated |
    Select-Object -Last 2

$time0 = $last2rel[0].TimeGenerated
$time1 = $last2rel[1].TimeGenerated

$rel0 = $last2rel[0].SystemStabilityIndex
$rel1 = $last2rel[1].SystemStabilityIndex

switch ($rel1 - $rel0) {
    {$_ -gt 0} { $arrow = "↑"; break }
    {$_ -eq 0} { $arrow = "→"; break }
    {$_ -lt 0} { $arrow = "↓"; break }
}

$outstr = "安定性指標:`n`n"
$outstr += "{0,-16}  {1,-16}" -f $time0.ToString("yyyy/MM/dd HH:mm"), $time1.ToString("yyyy/MM/dd HH:mm")
$outstr += "`n----------------  ----------------`n"
$outstr += "{0,16:N2}  {1,14:N2} {2}" -f $rel0, $rel1, $arrow

$eventime0 = $last2rel[1].StartMeasurementDate
$eventime1 = $last2rel[1].EndMeasurementDate
$records = Get-CimInstance -ClassName Win32_ReliabilityRecords |Where-Object {($_.TimeGenerated -ge $eventime0) -and ($_.TimeGenerated -lt $eventime1)} | Sort-Object TimeGenerated

$outstr |Out-Host

if ($records.Count -eq 0) {
  "`n`nイベント:`n信頼性に関連するログは記録されていません。"
} else {
  "`n`nイベント:"
  $records |Select-Object TimeGenerated, @{Name="EventId"; Expression={$_.EventIdentifier}}, LogFile, Message |Out-Host
  $answer = Read-Host "イベントの詳細を表示しますか? (Y/N)"
  if ($answer.ToUpper() -eq "Y") {
    $results = foreach ($record in $records) {
    $event = Get-WinEvent -FilterHashtable @{
        LogName = $record.LogFile
        Id      = $record.EventIdentifier
    } -ErrorAction SilentlyContinue |
      Where-Object { $_.RecordId -eq $record.RecordNumber } |
      Select-Object -First 1
      [PSCustomObject]@{
          TimeGenerated    = $record.TimeGenerated
          SourceName       = $record.SourceName
          EventID          = $record.EventIdentifier
          LogFile          = $record.LogFile
          LevelDisplayName = $event.LevelDisplayName
          Message          = $record.Message
      }
    }
    Foreach($result in $results) {
      $result
      Read-Host "Enterキーで次へ"
    }
    "(終了)"
  }
}