Edit - ignore this, derp moment. Previous times I have set this up, set up acknowledgements to stop the subsequent messages.
In your latter scenario, if a device goes down at 4 AM the alert will fire and be active but he won't get any email at all (even when 6 AM rolls around). At 6 AM, the alert is already active for the node so it shouldn't send the email.
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Re: Alerts don't start if node goes down before custom alert time
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