Add sparklines for node list

[jeefy]

Dashboard does not display metrics for nodes. This should be fairly easy to add, basing things off of the code used for Pods.

[feloy]

@jeefy Which metrics precisely would you like to be displayed?

[jeefy]

CPU / Memory are the two that are collected. :)

[shu-mutou]

@jeefy Pie charts for CPUs and memory of kind-0.2.1 cluster are shown in my dashboard like below. Are these pie charts what you want?

[jeefy]

I was thinking we could show the same sparklines that we display for Pod metrics. Thoughts?

[shu-mutou]

Now, I understand what you wants. I found NodeList object has "CumulativeMetrics", but it seems to be cpu/memory history for all of nodes, rather than for each node.
If we can get cpu/memory history for each node independently, we would able to add columns for sparklines into "Nodes" table, I think.
Do you know the other way to get cpu/memory history for each nodes?

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