Setting Up Alerts for Failed Functions Triggered by Event Hub and HTTP Triggers

Question

I would like to receive alerts when a function executed via an Event Hub trigger fails. When achieving a similar outcome with an HTTP trigger, I used a query like the following to configure alert rules and receive alert emails.

ApiManagementGatewayLogs
  | where ResponseCode > 499

However, functions executed via the Event Hub trigger do not record status codes as shown below, and because they do not go through API Gateway, I believe they are not logged in ApiManagementGatewayLogs.

I would greatly appreciate any advice on how to solve this problem.

Answer 1

KURAMOTOAHUJATAIRA-3118, thank you for posting this question on Microsoft Q&A.

The recommended way to monitor execution of Azure Functions is using ApplicationInsigts. You can enable it for your AzureFunction using the instruction here - Enable Application Insights integration.

Once it is enabled, the target ApplicationInsights logs has 2 tables which can be used for monitoring execution errors:

traces and exceptions

In traces table, the error events are logged with severityLevel=3, which can be used to filter the logs and review if there any errors, this can also be used to set up alerting:

traces
| where severityLevel == 3

Similarly, the exceptions table can also be used in isolated fashion or by joining on the operation_Id column to get details result.

More detailed guidelines and suggestions for advanced monitoring is also available here - Monitor Azure Functions and Event Hubs

Hope this helps.

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