Support told me that they can't really give an ETA on this since "these kinds of issues are prioritized on many factors". I checked with my Cisco/Meraki architect we partner with, and his response was that this is not normally something exposed to customers, and could be an error on the part of the UI team or something planned to be rolled out. So still not real clarification as to why this graph is showing in Summary Report with "Insufficient Info" for all networks.
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