A quick script to dump the currently-configured alarms of a number of vCenters.

list_vcenter_alarms.ps1

Add-PSSnapin VMware.VimAutomation.Core
 
 #A list of vCenter servers, one per line
$vcenterservers = Get-Content "vCenter_Servers.txt"
foreach ($vcenterserver in $vcenterservers)
{
	Connect-VIServer -Server $vcenterserver -WarningAction SilentlyContinue | Out-Null

	$output = foreach ($alarm in (Get-AlarmDefinition | Sort Name | Get-AlarmAction))
	{
		$threshold = foreach ($expression in ($alarm | %{$_.AlarmDefinition.ExtensionData.Info.Expression.Expression}))
		{
			if ($expression.EventTypeId -or ($expression | %{$_.Expression}))
			{
				if ($expression.Status) { switch ($expression.Status) { "red" {$status = "Alert"} "yellow" {$status = "Warning"} "green" {$status = "Normal"}}; "" + $status + ": " + $expression.EventTypeId } else { $expression.EventTypeId }         
			}
			elseif ($expression.EventType)
			{
				$expression.EventType
			}
		   
			if ($expression.Yellow -and $expression.Red)
			{
				if (!$expression.Yellow) { $warning = "Warning: " + $expression.Operator } else { $warning = "Warning: " + $expression.Operator + " to " + $expression.Yellow };
				if (!$expression.Red) { $alert = "Alert: " + $expression.Operator } else { $alert = "Alert: " + $expression.Operator + " to " + $expression.Red };
				$warning + " " + $alert
			}
		}  
	   
		$alarm | Select-Object @{N="Alarm";E={$alarm | %{$_.AlarmDefinition.Name}}},
							   @{N="Description";E={$alarm | %{$_.AlarmDefinition.Description}}},
							   @{N="Threshold";E={[string]::Join(" // ", ($threshold))}},
							   @{N="Action";E={if ($alarm.ActionType -match "SendEmail") { "" + $alarm.ActionType + " to " + $alarm.To } else { "" + $alarm.ActionType }}}
	}
	$outfile = "alarms" + $vcenterserver + ".csv"
	$output | Export-Csv $outfile -UseCulture -NoTypeInformation
	Disconnect-VIServer -Server $vcenterserver -Force:$true -Confirm:$false
}
Remove-PSSnapin VMware.VimAutomation.Core