In order to trigger server restart we need to know not only if a certain template field requires a restart or not (in conf metadata) but we also need to know if a certain template is being used to configure caches or not. We could do this with a series of DMR calls from Admin console but it would be simpler to add DMR op that given a template returns caches it configures. In the case when the list of caches is empty we can safely conclude that changing the template does not require server restart even if some fields requiring restart are changed.