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42fd8fe325
Instead of using a global random number generator for all `randRes`, have each value use its own. This removes the need for locking and managing concurrent safe access to the global. Also, the field, given the `Reservoir` type is not concurrent safe and the metric pipeline guards this, does not need a `sync.Mutex` to guard it. Supersedes https://github.com/open-telemetry/opentelemetry-go/pull/5815 Fix #5814 ### Performance Analysis This change has approximately equivalent performance as the existing code based on existing benchmarks. ```terminal goos: linux goarch: amd64 pkg: go.opentelemetry.io/otel/sdk/metric cpu: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz │ old.txt │ new.txt │ │ sec/op │ sec/op vs base │ Exemplars/Int64Counter/8-8 14.00µ ± 3% 13.44µ ± 4% -3.98% (p=0.001 n=10) │ old.txt │ new.txt │ │ B/op │ B/op vs base │ Exemplars/Int64Counter/8-8 3.791Ki ± 0% 3.791Ki ± 0% ~ (p=1.000 n=10) ¹ ¹ all samples are equal │ old.txt │ new.txt │ │ allocs/op │ allocs/op vs base │ Exemplars/Int64Counter/8-8 84.00 ± 0% 84.00 ± 0% ~ (p=1.000 n=10) ¹ ¹ all samples are equal ```