You can see which action triggers are configured for an alarm.

Connect to a vSphere server.

1

Get all PowerCLI supported alarm actions for the Host Processor Status alarm.

Get-AlarmDefinition -Name "Host Processor Status" | Get-AlarmAction -ActionType "ExecuteScript", "SendSNMP", "SendEmail"
2

Get all the triggers for the first alarm definition found.

Get-AlarmAction -AlarmDefinition (Get-AlarmDefinition | select -First 1) | Get-AlarmActionTrigger