Application Insights: How to filter only errors

Question

Application Insights distinguishes multiple event types, some of which can potentially represent an error:

• Traces have a verbosity level and those above warning or error represent error conditions
• Requests have a status code and those equal to or above 400 represent error conditions
• Exceptions are always errors.

Now you'd think I can easily filter the search view to show me only all those events representing an error condition, but I can't figure out how.

Do I really need to use the Analytics query stuff to do this?

Answer 1

To look at errors within the Azure Portal, the best way to get the pre-filtered view you're looking for is to use the Failures blade rather than Search:

This view shows requests with status codes indicating failure, dependencies indicating failures, and exceptions - in addition to additional filtering tools curated for investigating error scenarios.

Traces aren't covered here, but will be available when you drill down from the Failures blade to a representative transaction: