How can I stop the duplication of logs in Application Insights?

Got it! You're seeing duplicated and noisy error logs in Application Insights after moving your Azure Function to .NET 8 Isolated Worker Model, right? The extra errors like "EventName: 0" and RpcException Clutter your logs and make it hard to focus on your custom errors. And you can use a focused approach to reduce those noisy logs in your code.

In your startup or telemetry configuration, add a Telemetry Processor to exclude unwanted events

using Microsoft.ApplicationInsights.Channel;

using Microsoft.ApplicationInsights.Extensibility;

public class IgnoreSpecificExceptionsProcessor : ITelemetryProcessor

{

Hello Charlotte Birkett •,

Below recommendation help to stop duplicate logs in Application Insights after upgrading to the .NET 8 Isolated Worker model:

Suppress default exception logging :Use WorkerOptions.ExceptionHandler to handle errors yourself and stop the worker from logging them again.

Filter noisy log categories :Configure ILogger to suppress logs like:

• Microsoft.Azure.WebJobs.Script.Workers.Rpc
• Microsoft.AspNetCore

Tweak OpenTelemetry :Disable automatic exception recording (RecordException = false) if you're logging errors manually.

Use Telemetry Processors: Filter out unwanted logs (like RpcException) before they’re sent to Application Insights.

You can use Azure Monitor sampling to reduce costs, but only after you’ve filtered out the truly unnecessary logs. Sampling can help with volume, but not noise.

Hello Charlotte Birkett •,

Just checking in to see if you've had a chance to review my previous response and let me know if you have any additional questions.