Per the documentation when a dashboard is deleted it is moved to the "trash" area where it will remain for 60 days and then be permanently deleted.
As a Jira Admin I can navigate to System / Manage Dashboard and see the dashboards in the trash, but my only available action for those dashboards is to restore them.
Is there a way to immediately permanently delete them, as can be done with Projects in the trash bin?
I've looked at the API, and see no option available there.