Telemetry processor to ignore certain 404 errors in Application Insights

My404Filter.cs

using System;
using Microsoft.ApplicationInsights.Channel;
using Microsoft.ApplicationInsights.DataContracts;
using Microsoft.ApplicationInsights.Extensibility;

namespace Samples
{
	public class My404Filter : ITelemetryProcessor
	{
		private ITelemetryProcessor Next { get; set; }

		public My404Filter(ITelemetryProcessor next)
		{
			Next = next;
		}

		public void Process(ITelemetry item)
		{
			// To filter out an item, just return
			if (ShouldIgnoreRequest(item))
			{
				return;
			}

			Next.Process(item);
		}

		private static bool ShouldIgnoreRequest(ITelemetry item)
		{
			if (item.Context.Operation.Name != null)
			{
				var operationName = item.Context.Operation.Name.ToLower();

				if (operationName.StartsWith("get api/getobjectwith404s"))
				{
					var req = item as RequestTelemetry;

					return req != null && req.ResponseCode.Equals("404", StringComparison.OrdinalIgnoreCase);
				}
				return false;
			}
			return false;
		}
	}
}