Get all AWS EC2 Instances that lack a cloudwatch metric or composite alarm

Get-AllEC2InstancesWithAlarmTypes.ps1

#Originally created by Liz Clements in 2022
#License: MIT

$AWSRegion = 'us-west-2'
$AWSProfileLocation = ("$env:USERPROFILE\.aws\credentials")
$AWSProfileName = 'default'

#Grab all alarms, that have instance ids directly associated with them
$AlarmData = (Get-CWAlarm `
	-ProfileLocation $AWSProfileLocation -ProfileName $AWSProfileName -Region $AWSRegion) `
	| Where-Object { $_.Dimensions.Name -eq 'InstanceId' }


#Parse the InstanceIds and store the type of alarms that are associated to each
$InstanceAlarmMap = @{};
$InstanceAlarmCountMap = @{};
try {
	ForEach($Alarm in $AlarmData)
	{
		$Alarm_InstanceId = $Alarm.Dimensions `
			| Where-Object { $_.Name -eq "InstanceId" } `
			| Select-Object Value -ExpandProperty Value
		
		#Store the Alarm type
		$InstanceAlarmMap[$Alarm_InstanceId] = $true # update this to include composites
		#Store the count
		if($InstanceAlarmCountMap.ContainsKey($Alarm_InstanceId) -eq $true)
		{
			$InstanceAlarmCountMap[$Alarm_InstanceId] = $InstanceAlarmCountMap[$Alarm_InstanceId] + 1
		}
		else
		{
			$InstanceAlarmCountMap[$Alarm_InstanceId] = 1
		}
	}
}
catch {
	Write-Error "Grabbing alarm data failed!!"
	Exit 1
}

$ListOfAllInstances = `
	(Get-EC2Instance -Region $AWSRegion -ProfileLocation $AWSProfileLocation -ProfileName $AWSProfileName).Instances `

$ListOfInstances_WithAlarmData = $ListOfAllInstances `
	| Select-Object `
	@{ `
		Name="ServerAlias"; `
		Expression= { `
			$_.Tags | Where-Object Key -eq "Name" | Select-Object Value -ExpandProperty Value `
		} `
	} `
	, @{ `
		Name="State"; `
		Expression={ $_.State.Name } `
	} `
	, @{ `
		Name="AlarmType"; `
		Expression= { `
			if($InstanceAlarmMap[$_.InstanceId]) { "Metric" } `
			else { "None" } `
		} `
	} `
	, @{ `
		Name="AlarmCount"; `
		Expression= { `
			if($InstanceAlarmCountMap.ContainsKey($_.InstanceId) -eq $false) { "0" } `
			else { $InstanceAlarmCountMap[$_.InstanceId] } `
		} `
	}, InstanceId, PrivateIpAddress



#$ListOfInstances_WithAlarmData | Sort-Object -Property AlarmType, State, ServerAlias | Format-Table


$Gridview_Selection = $ListOfInstances_WithAlarmData | Sort-Object -Property AlarmType, State, ServerAlias | Out-Gridview -PassThru
#Output the selection
$Gridview_Selection | Format-Table
#Copy to clipboard all of the private ip addresses
Set-Clipboard -Value $Gridview_Selection.PrivateIpAddress