How to tell Application Insights to ignore 404 responses
You can modify the request telemetry and mark it as a Success (not Fail). This way, the request will be properly logged by the AI but as a successful one.You need to implement a Telemetry Initializer.
Example:
public class CustomTelemetryInitializer : ITelemetryInitializer{ public void Initialize(ITelemetry telemetry) { switch (telemetry) { case RequestTelemetry request when request.ResponseCode == "404": request.Success = true; break; } }}
You can filter AI telemetry by implementing a Telemetry Processor.For example, you can filter out 404 Not Found telemetry by implementing the ITelemetryProcessor 'Process' method as follows:
public void Process(ITelemetry item){ RequestTelemetry requestTelemetry = item as RequestTelemetry; if (requestTelemetry != null && int.Parse(requestTelemetry.ResponseCode) == (int)HttpStatusCode.NotFound) { return; } this.Next.Process(item);}