OpenTelemetry SDK
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    Variable METRIC_DOTNET_GC_LAST_COLLECTION_HEAP_FRAGMENTATION_SIZEConst

    METRIC_DOTNET_GC_LAST_COLLECTION_HEAP_FRAGMENTATION_SIZE: "dotnet.gc.last_collection.heap.fragmentation.size" = ...

    The heap fragmentation, as observed during the latest garbage collection.

    Meter name: System.Runtime; Added in: .NET 9.0. This metric reports the same values as calling GC.GetGCMemoryInfo().GenerationInfo.FragmentationAfterBytes.