Try using PowerCLI (Module VMware.VimAutomation.vROps) and use cmdlet Get-OMAlertDefinition.
Get-OMAlertDefinition can be used to find the available alert definitions in the system. You can filter the output to show alert definitions of a given alert type and subtype.
Hope this is useful for you.
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I dont see anything such which lists out all predefined alerts, I am wondering if we have come across something apart from vmware documentation depending on versions
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Getting the alert definitions is easy the problem i thing ( Using REST anyway) is filtering them based on being enabled or not.
I know using rest there is no way to quay the policies so no way to know if they are enabled or not. running https://yourvrops/suite-api/api/alertdefinitions will list all the alert deffs you have. You can filter base on adapterKind, resourceKind and ID but that is about it.