Github user serg38 commented on the issue: https://github.com/apache/cloudstack/pull/1773 @ustcweizhou @priyankparihar @borisstoyanov The default behavior was always equivalent of force=true. We seem to agree that the UI behavior should remain forced=true but with extra warning. We can either change default confirmation "Please confirm that you want to delete this template." e.g. to "Please confirm that you want to delete this template. Features that depends on the template presence might no longer work". But I think the better option will be to have response tag in listTemplate call to indicate if active VMs exists or not. Then warning can be given only to such templates. As for API side we might still change default behavior but we need to explicitly document it in Release Notes so users can get prepared and change instances of deleteTemplate execution to use forced=true or not as needed.
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