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5b808c6ad5
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-tracer-obs.out │
│ sec/op │
Tracer/SpanStarted-8 7.436n ± 6%
Tracer/SpanLive-8 9.987n ± 8%
Tracer/SpanEnded-8 11.32n ± 7%
NewTracer-8 87.64n ± 6%
geomean 16.48n
│ enc-trace-sdk-tracer-obs.out │
│ B/op │
Tracer/SpanStarted-8 0.000 ± 0%
Tracer/SpanLive-8 0.000 ± 0%
Tracer/SpanEnded-8 0.000 ± 0%
NewTracer-8 0.000 ± 0%
geomean ¹
¹ summaries must be >0 to compute geomean
│ enc-trace-sdk-tracer-obs.out │
│ allocs/op │
Tracer/SpanStarted-8 0.000 ± 0%
Tracer/SpanLive-8 0.000 ± 0%
Tracer/SpanEnded-8 0.000 ± 0%
NewTracer-8 0.000 ± 0%
geomean ¹
¹ summaries must be >0 to compute geomean
```
#### Existing `sdk/trace` benchmarks
```console
> benchstat main.out enc-trace-sdk-tracer-obs.out
goos: linux
goarch: amd64
pkg: go.opentelemetry.io/otel/sdk/trace
cpu: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
│ main.out │ enc-trace-sdk-tracer-obs.out │
│ sec/op │ sec/op vs base │
SpanEnd/ObservabilityEnabled-8 188.5n ± 4% 131.5n ± 32% -30.24% (p=0.000 n=10)
TraceStart/ObservabilityEnabled-8 886.9n ± 8% 663.9n ± 2% -25.14% (p=0.000 n=10)
geomean 408.9n 295.5n -27.73%
│ main.out │ enc-trace-sdk-tracer-obs.out │
│ B/op │ B/op vs base │
SpanEnd/ObservabilityEnabled-8 16.00 ± 0% 0.00 ± 0% -100.00% (p=0.000 n=10)
TraceStart/ObservabilityEnabled-8 608.0 ± 0% 576.0 ± 0% -5.26% (p=0.000 n=10)
geomean 98.63 ? ¹ ²
¹ summaries must be >0 to compute geomean
² ratios must be >0 to compute geomean
│ main.out │ enc-trace-sdk-tracer-obs.out │
│ allocs/op │ allocs/op vs base │
SpanEnd/ObservabilityEnabled-8 1.000 ± 0% 0.000 ± 0% -100.00% (p=0.000 n=10)
TraceStart/ObservabilityEnabled-8 5.000 ± 0% 3.000 ± 0% -40.00% (p=0.000 n=10)
geomean 2.236 ? ¹ ²
¹ summaries must be >0 to compute geomean
² ratios must be >0 to compute geomean
```
---------
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>