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The gap in this graph is when the reboot happened. The memory drop is before the reboot (There is 16 GB in the machine, and free confirms the drop -- so it isn't a graph issue).

Is the memory drop actually before the reboot, or is this just a trick due to RRD consolidation?

enter image description here

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I would say that the drop indeed happened about a week before the reboot, as the consolidation phase is visible in form of the small step in the dropping graph, where averaging is taking place.

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