I am working on a "haven't heard from you in a while" use case.  I would like 
to identify measurements which haven't been pushed to influx in the normal 
expected elapsed time between measurements.

let's say I have some measurements like this:

10-Oct color=blue, value=1.8, measurement=mycolors
12-Oct color=blue, value=1.1, measurement=mycolors
14-Oct color=blue, value=1.0, measurement=mycolors

//the normal elapsed time is 2 days between measurements for tag color=blue

10-Oct color=red, value=2.0, measurement=mycolors
17-Oct color=red, value=2.5, measurement=mycolors
24-Oct color=red, value=2.1, measurement=mycolors

//the normal elapsed time is 7 days between measurements for tag color=red

I want to identify the cases where I haven't recieved a measurement in the 
normal expected elapsed time grouped by a given tag.  Something like this 
(which doesn't work):

select value, color from mycolors where time < now() - elapsed(value) group by 
color

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