a little more searching went a long way:
https://groups.google.com/d/msg/influxdb/YZ_ZcJjfabM/4XWbKMbLAwAJ

for visitors from the future, cardinality refers to combinations *used* 
rather than combinations *possible*

On Tuesday, August 9, 2016 at 5:12:28 PM UTC-4, Sam Hatchett wrote:
>
> I've searched for an answer to this specific question, but turned up 
> nothing specific.
>
> Is series cardinality affected by actual use, or by combinatorial math 
> alone?
>
> For example:
>
> metric,asset_id=abc,geohash=gbsuv7ztq
> metric,asset_id=xyz,geohash=gbsuv7ztr
>
> ... in this schema, a series will have been generated by some asset 
> (important information), and that asset will have a location associated 
> with it. But, the location of each asset will be unique to that asset 
> alone. Asset 'abc' will never be located somewhere else and therefore will 
> only ever have that one geohash. This is relational data, of course, which 
> I am trying to shoehorn into a time-series database - but only for the sake 
> of getting data plotted in Grafana's new WorldMap panel.
>
> Any clarification of cardinality in this situation would be helpful. I'm 
> expecting to have ~200k assets (and therefore ~200k geohashes) at maximum. 
> Alternatively, if anyone has more experience with geohashing for grafana or 
> can point me to resources, I'd be very grateful.
>

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