Device UP - RRD Graph - Add Downtime to the legend

Feature Requests
1

Hi

Will it be possible to an additional heading as days but called hours so to that the amount of hours the device has been up will also be displayed on the graph below

Also can another metric like uptime be added but called downtime be added so a person can see how long it has been down.

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2

Or maybe a new graph can be created called downtime which will be the inverse of the above graph