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Bruce Merry 02c779cfa3 Prometheus: make $__range more precise (#21722)
* Make $__range more precise in Prometheus

It is now always equivalent to `${__range_s}s`, rather than rounding
down to an integer multiple of the biggest possible unit. For example,
a range of 47 hours is now represented as `169200s` rather than `1d`.

Closes #21689.

* Update a unit test to match new __range calc
2020-02-11 14:28:06 +01:00
..
2020-01-30 07:46:45 -08:00