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David Ashpole 68d2f72614 Use sync.Map and atomics for lastvalue aggregations (#7478 )

Depends on https://github.com/open-telemetry/opentelemetry-go/pull/7474

This applies similar optimizations as
https://github.com/open-telemetry/opentelemetry-go/pull/7427 to the last
value aggregation.

Changes for last value are contained in
https://github.com/open-telemetry/opentelemetry-go/pull/7478/commits/27e14829716bfa5b6cfcdf4841c45c93bf5f0a91.


Parallel benchmarks:
```
                                                                   │   main.txt   │               lv.txt               │
                                                                   │    sec/op    │   sec/op     vs base               │
SyncMeasure/NoView/ExemplarsDisabled/Int64Gauge/Attributes/10-24     264.60n ± 3%   66.46n ± 1%  -74.88% (p=0.002 n=6)
SyncMeasure/NoView/ExemplarsDisabled/Float64Gauge/Attributes/10-24   270.25n ± 4%   69.69n ± 1%  -74.21% (p=0.002 n=6)
geomean                                                               267.4n        68.05n       -74.55%
```

Co-authored-by: Damien Mathieu <42@dmathieu.com>

2025-12-16 09:23:13 +01:00

instrumentation

…

internal

chore: sdk/internal/x - generate x package from shared template (#7495 )

2025-10-16 09:23:17 +02:00

log

sdk/log: improve Processor documentation (#7695 )

2025-12-12 19:41:20 +01:00

metric

Use sync.Map and atomics for lastvalue aggregations (#7478 )

2025-12-16 09:23:13 +01:00