Application Insights - Failures in Azure API Management

In this article, we're going to talk about an Application Insights feature that would help you to spot any failures in your Azure API Management instance or any Azure serverless components as well. Inside your Application Insights, you can browse to losses, as it shows in the screenshot.

Then, you would be able to spot straight away the top 3 failing response codes and top 3 exceptions triggered on your API Management instance.
You'd need to set your strategy in here, how you're moving forward with this. You may want to prioritize fixing all 500 HTTP response codes before others since the 500 response code indicates an internal server error, which is an error in the back-end service for our API Management. While the 404 response code might mean that some users are trying to call APIs that don't exist in the API Management yet, you need to investigate more to understand what is happening.

Also, you can see failed operations as well, the overall execution count, and then how many times it had failed.

This way, you can prioritize which APIs you need to focus on first. Check how many times these APIs are called and how many times they're failing. Of course, you want to start fixing the most popular APIs that are being called very often and give this more priority than other APIs.