Get Threadpool, worker and IOCP thread statistics

ThreadpoolStats.cs

using System;
using System.Text;
using System.Threading;

public static class ThreadpoolStats
{
	public static string GetThreadPoolStats()
	{
		ThreadPool.GetMaxThreads(out int maxWorkerThreads, out int maxIoThreads);
		ThreadPool.GetAvailableThreads(out int freeWorkerThreads, out int freeIoThreads);
		ThreadPool.GetMinThreads(out int minWorkerThreads, out int minIoThreads);
		int busyIoThreads = maxIoThreads - freeIoThreads;
		int busyWorkerThreads = maxWorkerThreads - freeWorkerThreads;
		
		var builder = new StringBuilder()
			.AppendLine("Threadpool Statistics:")
			.AppendLine($"  Thread Count:             {ThreadPool.ThreadCount}")
			.AppendLine($"  Pending WorkItem Count:   {ThreadPool.PendingWorkItemCount}")
			.AppendLine($"  Completed WorkItem Count: {ThreadPool.CompletedWorkItemCount}")
			.AppendLine("  IOCP threads:")
			.AppendLine($"    Busy: {busyIoThreads}")
			.AppendLine($"    Free: {freeIoThreads}")
			.AppendLine($"    Min:  {minIoThreads}")
			.AppendLine($"    Max:  {maxIoThreads}")
			.AppendLine("  Worker threads:")
			.AppendLine($"    Busy: {busyWorkerThreads}")
			.AppendLine($"    Free: {freeWorkerThreads}")
			.AppendLine($"    Min:  {minWorkerThreads}")
			.AppendLine($"    Max:  {maxWorkerThreads}");
			
		return builder.ToString();
	}
}