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opentelemetry-go/sdk
Tyler Yahn e4ab314112 Encapsulate SDK BatchSpanProcessor observability (#7332)
Split from #7316 

[Follow
guidelines](a5dcd68ebb/CONTRIBUTING.md (encapsulation))
and move instrumentation into its own type.

### Benchmarks

#### Added `sdk/trace/internal/observ` benchmarks

```
goos: linux
goarch: amd64
pkg: go.opentelemetry.io/otel/sdk/trace/internal/observ
cpu: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
                         │ enc-trace-sdk-bsp-obs.out │
                         │          sec/op           │
BSP/Processed-8                        0.6394n ±  2%
BSP/ProcessedQueueFull-8               0.6806n ±  3%
BSP/Callback-8                          3.591µ ± 12%
geomean                                 11.60n

                         │ enc-trace-sdk-bsp-obs.out │
                         │           B/op            │
BSP/Processed-8                         0.000 ± 0%
BSP/ProcessedQueueFull-8                0.000 ± 0%
BSP/Callback-8                        2.626Ki ± 0%
geomean                                            ¹
¹ summaries must be >0 to compute geomean

                         │ enc-trace-sdk-bsp-obs.out │
                         │         allocs/op         │
BSP/Processed-8                         0.000 ± 0%
BSP/ProcessedQueueFull-8                0.000 ± 0%
BSP/Callback-8                          16.00 ± 0%
geomean                                            ¹
¹ summaries must be >0 to compute geomean
```

#### Existing `sdk/trace` benchmarks

None
2025-09-15 11:18:19 -07:00
..
2025-08-29 12:42:52 -07:00

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