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Total Performance -> Disk Latency is empty

Hello, guys!
Some of my PMM2 graphs show nothing.
This is what my Disk Dashboard (Total Performance) looks like right now:
Disk Latency, Avg Disks Operations Merge Ratio and Disk IO Size are empty.
BUT... if it's a specific device (sda, as the following screenshot shows) everything is OK:
How do I fix those empty Total Performance disk graphs?


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