Fixes broken sdk/metric benchmarks #2459
Merged
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Currently sdk/metric benchmarks panic trying to create an exact aggregator. These were removed in #2348. This fix retains benchmarks around the creation of histograms, but moves them into a histogram creation.
You can see the panic: https://gist.github.com/MadVikingGod/f7f1eb41aa83be4729481f7c10415be5