How to exclude some URLs from Http server errors 5xx alert signal type

Question

How to exclude some URLs from Http server errors 5xx alert signal type

Venkatesh Kacham 6 Microsoft Employee

I have a Alert configured on my Azure App service . The alert signal type is Metric to fire whenever any HTTP Internal server error 5xx occurs . I would like to exclude/skip certain requests with specific URLs from the alerting logic. Is it possible to do it ?

ajkuma 28,111 Reputation points Microsoft Employee Moderator

2022-09-28T19:43:04.697+00:00

VenkateshKacham-6574, Thanks for the question. As I understand you're referring to Metrics alerts from "Monitoring" blade, could you please confirm on this and share more details about this requirement?

You may take a look at the suggestions shared by Ivan Yang on SO, it talks about querying and adding the right clauses' (per requirement).
Venkatesh Kacham 6 Reputation points Microsoft Employee

2022-09-29T11:06:41.177+00:00

Im already aware of the suggestions shared by Ivan Yang, which is to query the Application Insights and filter based on the request URLs / methods and whatever columns available in the requests/exceptions/ other tables available.

My requirement is , the alert that we have created is same what you have mentioned , the Metric alert for HTTP Server errors : Here the scenarios is , the App service is throwing 500.3 and the alert gets fired.
When we search the Requests in Application Insights for that particular period of time when a 5xx alert is fired , we dont find any entry .
Another point : If I dont have any Application Insights configured for my App Service and If the Metric alert 5xx is configured - then still this alert gets fired whenever the app is throwing 500.3 . So, what is the source of data for Azure when it fires the 5xx alert ?

1 answer

Your answer

ajkuma 28,111 Reputation points Microsoft Employee Moderator

2022-09-28T19:43:04.697+00:00

VenkateshKacham-6574, Thanks for the question. As I understand you're referring to Metrics alerts from "Monitoring" blade, could you please confirm on this and share more details about this requirement?

You may take a look at the suggestions shared by Ivan Yang on SO, it talks about querying and adding the right clauses' (per requirement).
Venkatesh Kacham 6 Reputation points Microsoft Employee

2022-09-29T11:06:41.177+00:00

Im already aware of the suggestions shared by Ivan Yang, which is to query the Application Insights and filter based on the request URLs / methods and whatever columns available in the requests/exceptions/ other tables available.

My requirement is , the alert that we have created is same what you have mentioned , the Metric alert for HTTP Server errors : Here the scenarios is , the App service is throwing 500.3 and the alert gets fired.
When we search the Requests in Application Insights for that particular period of time when a 5xx alert is fired , we dont find any entry .
Another point : If I dont have any Application Insights configured for my App Service and If the Metric alert 5xx is configured - then still this alert gets fired whenever the app is throwing 500.3 . So, what is the source of data for Azure when it fires the 5xx alert ?

Answer 1

@Venkatesh Kacham , Thanks for the follow-up and additional info.

These are default metrics and do not need anything to be enabled.

Well, I understand your requirement.

Any HTTP 5xx on application would fire this alert. HTTP 500.3 is subset of HTTP 5xx – so, it is expected that alert will be fired.
There is no provision to exclude certain URL from this alert.

At this time, one workaround ( as shared on SO)- is to use Diagnostic settings -> Send HTTP raw logs to Log analytics -> Write queries to filter and trigger alert based on your requirement.

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How to exclude some URLs from Http server errors 5xx alert signal type

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