Incubator-superset: [Dashboard Feature] Copy charts based on a dimension value

[vylc]

A flavor of templating, it would be a killer feature to:
(1) Programmatically create charts. The use case here is if I'm monitoring a bunch of servers and need to see each one as a time series for CPU usage.
(2) Create charts in bulk via the UI. The use case here is if I manage a bunch of products, regions, territories, I'd like to see each one at one glance, but as a dashboard creator, don't want to create 20 charts for each metric I want to monitor.

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• [ ] I have checked the superset logs for python stacktraces and included it here as text if any
• [ ] I have reproduced the issue with at least the latest released version of superset
• [ ] I have checked the issue tracker for the same issue and I haven't found one similar

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[mistercrunch]

I had conversations about arrays or matrix of charts before. Idea being to write a for loop around a chart and varying one or many control values (filter value, what to groupby, metric, ...).

There's power in this idea of "meta-charts" that can take one or many charts as input.

[mistercrunch]

Another idea would be to "export your dashboard as code", then check it into source control. Engineers can then alter the code, squeeze a for loop in there or something. It would all be pretty intuitive coming out of the codegen, except maybe for positioning & layout. Given a simpler API around layout it would be very powerful.

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