ui: custom chart tooltips don't work so well when using the "per node" option on large clusters

[a-robinson]

Clearly not very important right now since this is just a debug page, but we may have to grapple with this more meaningfully when a per-node breakdown option get added to the main dashboards.

[knz]

cc @couchand

[couchand]

Yep, 😿. We've got some nice designs for dealing with per-node charts of large clusters, cleaning this up for 2.2 is definitely a priority.

cc @piyush-singh @josueeee

[piyush-singh]

Definitely, @josueeee's designs are a fantastic way to handle large node counts (for 2.2):

[couchand]

Thanks for posting the screenshot @piyush-singh. It does look like we'll still need to do some iteration here to solve the problem described in this issue: if there are too many nodes, the tooltip will just extend past the visible area. It seems like at some point we should just show a subset of the node values, or a summary of some kind, and possibly provide a way to drill into more details if needed.

[knz]

Also maybe instead of using a list use a grid of nodes with little square boxes and the node number inside. And only display the hostname when hovering over the node number.

[a-robinson]

Just a note that this is actually pretty painful in practice when there's just one outlier in a per-node graph and you really want to know which node it is. I look forward to some sort of solution :)

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