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I think the metrics you are seeing are the previous ones from when you were still running the cluster, you can see there is no graph at 10:50, you can wait a while longer to see if the shaded graph phases out even more
I have the problem, when i start my cluster and run a simple notebook after notebook running a while the Memory still show Cached take a large of mount in Memory. Don't know why and also what to reduce the cached memory.