Andrew/otel optimizations#8030

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andrewlock wants to merge 20 commits intomasterfrom

andrew/otel-optimizations

Commits on Jan 8, 2026

Update ActivityBenchmark to set the global tracer (to disable telemetry etc)
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Ensure Otel instrumented APIs uses correctly configured tracer to reduce noise
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Add additional Activity benchmark (baseline) to make it easier to compare improvments
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Just use duck typing as it's kind of simpler to follow/understand, and closer to what we actually do anyway
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Move handler creation to DefaultActivityHandler (we only do this once normally)
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Add benchmark for testing Hierarchical IDs too
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Introduce ActivityKey to avoid concat
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Fix nullable annotations on IW3CActivity
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Fix more nullable annotations
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Avoid allocating a closure for ActivityMappingById.GetOrAdd if we can avoid it
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Don't allocate for ParentId if you don't need to
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Don't call Tracer.Instance.ActiveScope if we don't need to
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Extract StopActivitySlow as it's a rarely-called code path
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Simplify ShouldIGnoreBeOperationName because it's ~15 times faster
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Add allocation-free activity tags enumeration helpers.
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Avoid allocating and iterating links and activities if we don't have any
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Add unit tests
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Add debug-only guards for type
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Don't create the OpenTelemetryTags until we know we are going to use them (e.g. the activity is not ignored
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Optimize the handling of OTel tags in OtlpHelpers.AgentConvertSpan to reduce allocations
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