az monitor metrics alert create -n "Cpu80PercentAlert" --resource-group "learn-d04808ef-bd4c-4ae1-b331-0aef3cb9b52b" --scopes $VMID --condition "max percentage CPU > 80" --description "Virtual machine is running at or greater than 80% CPU utilization" --evaluation-frequency 1m --window-size 1m --severity 3

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references:

MS Docs MS Docs metric rule

Create metric rule Add-AzMetricAlertRuleV2 To disable: Add-AzMetricAlertRuleV2 -DisableRule

• To create a log search alert rule using PowerShell, use the New-AzScheduledQueryRule cmdlet.
• To create an activity log alert rule using PowerShell, use the New-AzActivityLogAlert cmdlet.