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Part of https://github.com/open-telemetry/opentelemetry-go/issues/7388 This adds benchmarks for making measurements that also record an exemplar. This will help demonstrate any improvements to locking in the exemplar reservoir. Parallel benchmarks: ``` goos: linux goarch: amd64 pkg: go.opentelemetry.io/otel/sdk/metric cpu: Intel(R) Xeon(R) CPU @ 2.20GHz BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64Counter/Attributes/0-24 57819 258.8 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64Counter/Attributes/1-24 46058 255.0 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64Counter/Attributes/10-24 70351 271.3 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64Counter/Attributes/0-24 67525 220.7 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64Counter/Attributes/1-24 67789 248.9 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64Counter/Attributes/10-24 63385 246.9 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64UpDownCounter/Attributes/0-24 67786 213.8 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64UpDownCounter/Attributes/1-24 73093 226.9 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64UpDownCounter/Attributes/10-24 55597 230.7 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64UpDownCounter/Attributes/0-24 77805 216.2 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64UpDownCounter/Attributes/1-24 71512 234.7 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64UpDownCounter/Attributes/10-24 60094 258.8 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64Histogram/Attributes/0-24 66192 266.3 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64Histogram/Attributes/1-24 50511 242.5 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64Histogram/Attributes/10-24 42548 295.6 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64Histogram/Attributes/0-24 48874 229.3 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64Histogram/Attributes/1-24 50904 271.5 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64Histogram/Attributes/10-24 59074 253.8 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/ExponentialInt64Histogram/Attributes/0-24 55216 292.2 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/ExponentialInt64Histogram/Attributes/1-24 53492 375.3 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/ExponentialInt64Histogram/Attributes/10-24 40346 273.5 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/ExponentialFloat64Histogram/Attributes/0-24 51520 310.9 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/ExponentialFloat64Histogram/Attributes/1-24 43227 303.2 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/ExponentialFloat64Histogram/Attributes/10-24 44754 295.4 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64Counter/Attributes/0-24 44091 294.7 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64Counter/Attributes/1-24 43164 300.3 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64Counter/Attributes/10-24 46014 269.3 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64Counter/Attributes/0-24 38978 281.3 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64Counter/Attributes/1-24 41292 316.6 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64Counter/Attributes/10-24 38986 303.3 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64UpDownCounter/Attributes/0-24 33555 299.0 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64UpDownCounter/Attributes/1-24 44396 322.2 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64UpDownCounter/Attributes/10-24 38211 273.0 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64UpDownCounter/Attributes/0-24 45652 296.9 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64UpDownCounter/Attributes/1-24 38984 270.8 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64UpDownCounter/Attributes/10-24 36280 313.2 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64Histogram/Attributes/0-24 34377 437.9 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64Histogram/Attributes/1-24 34992 344.9 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64Histogram/Attributes/10-24 33795 384.9 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64Histogram/Attributes/0-24 38080 353.7 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64Histogram/Attributes/1-24 36568 315.4 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64Histogram/Attributes/10-24 32418 309.7 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/ExponentialInt64Histogram/Attributes/0-24 33217 320.2 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/ExponentialInt64Histogram/Attributes/1-24 27937 407.7 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/ExponentialInt64Histogram/Attributes/10-24 30818 350.0 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/ExponentialFloat64Histogram/Attributes/0-24 36286 346.3 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/ExponentialFloat64Histogram/Attributes/1-24 35863 342.4 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/ExponentialFloat64Histogram/Attributes/10-24 32378 327.8 ns/op 0 B/op 0 allocs/op ``` Single-threaded benchmarks: ``` goos: linux goarch: amd64 pkg: go.opentelemetry.io/otel/sdk/metric cpu: Intel(R) Xeon(R) CPU @ 2.20GHz BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64Counter/Attributes/0 115218 109.8 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64Counter/Attributes/1 106142 112.0 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64Counter/Attributes/10 101562 115.5 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64Counter/Attributes/0 93019 112.1 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64Counter/Attributes/1 107089 117.4 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64Counter/Attributes/10 106411 117.6 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64UpDownCounter/Attributes/0 110683 113.6 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64UpDownCounter/Attributes/1 84825 122.5 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64UpDownCounter/Attributes/10 98952 113.9 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64UpDownCounter/Attributes/0 115419 105.2 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64UpDownCounter/Attributes/1 97251 114.7 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64UpDownCounter/Attributes/10 106036 111.8 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64Histogram/Attributes/0 130296 92.98 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64Histogram/Attributes/1 120679 100.5 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Int64Histogram/Attributes/10 116985 102.1 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64Histogram/Attributes/0 125479 96.42 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64Histogram/Attributes/1 115527 103.7 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/Float64Histogram/Attributes/10 89858 117.8 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/ExponentialInt64Histogram/Attributes/0 76768 152.9 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/ExponentialInt64Histogram/Attributes/1 72832 161.2 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/ExponentialInt64Histogram/Attributes/10 73298 160.9 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/ExponentialFloat64Histogram/Attributes/0 81826 154.2 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/ExponentialFloat64Histogram/Attributes/1 73779 158.5 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsDisabled/ExponentialFloat64Histogram/Attributes/10 75606 161.4 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64Counter/Attributes/0 61503 188.5 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64Counter/Attributes/1 63260 185.4 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64Counter/Attributes/10 62704 189.5 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64Counter/Attributes/0 63615 180.3 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64Counter/Attributes/1 62072 190.2 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64Counter/Attributes/10 61260 192.1 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64UpDownCounter/Attributes/0 61561 182.6 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64UpDownCounter/Attributes/1 60334 192.7 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64UpDownCounter/Attributes/10 64114 192.2 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64UpDownCounter/Attributes/0 63980 181.5 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64UpDownCounter/Attributes/1 61138 189.6 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64UpDownCounter/Attributes/10 62150 196.6 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64Histogram/Attributes/0 51895 237.9 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64Histogram/Attributes/1 52554 230.2 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Int64Histogram/Attributes/10 53581 228.3 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64Histogram/Attributes/0 55407 221.5 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64Histogram/Attributes/1 50701 226.0 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/Float64Histogram/Attributes/10 50460 231.3 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/ExponentialInt64Histogram/Attributes/0 53390 221.5 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/ExponentialInt64Histogram/Attributes/1 51373 229.6 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/ExponentialInt64Histogram/Attributes/10 51154 228.5 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/ExponentialFloat64Histogram/Attributes/0 52167 230.6 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/ExponentialFloat64Histogram/Attributes/1 48598 247.6 ns/op 0 B/op 0 allocs/op BenchmarkSyncMeasure/NoView/ExemplarsEnabled/ExponentialFloat64Histogram/Attributes/10 51086 230.8 ns/op 0 B/op 0 allocs/op ```