OpenTelemetry SDK
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    Variable METRIC_DOTNET_THREAD_POOL_QUEUE_LENGTHConst

    METRIC_DOTNET_THREAD_POOL_QUEUE_LENGTH: "dotnet.thread_pool.queue.length" = ...

    The number of work items that are currently queued to be processed by the thread pool.

    Meter name: System.Runtime; Added in: .NET 9.0. This metric reports the same values as calling ThreadPool.PendingWorkItemCount.