We have several user created dashboards with metrics we don't want customers to see that are shared with everyone. Is it possible to prevent non-administrators from creating dashboards at all?
You can't prevent users from creating Dashboards, but you can prevent them from being shared. Just edit the Global Permissions (https://confluence.atlassian.com/display/JIRA/Managing+Global+Permissions) and make sure only the users / groups that you want have this ability.
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