How To correlate requests between Azure Application Gateway and Azure App Service?

Harsh Thakor 116

How to correlate requests between Azure Application Gateway WAF V2 and Azure App Service, what is the common attribute other than the timestamp in the logs of log Analytics workspace between both services to track the request?

KapilAnanth-MSFT 38,041 Reputation points Microsoft Employee

2023-10-11T14:34:28.9633333+00:00
@Harsh Thakor

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.

Currently, this feature is not supported.

App gateway and Web Apps are two different services.

The platform here, does not have any visibility as to how you have configured your set up.

This is true, as there could be any service acting as backend (which may not support logging unlike App Service)

Hence, there is no such attribute that is used by both the services.

The challenge is that the platform cannot be aware of this as it’s logging the Data plane logs and not Control plane logs.

I would suggest you to

Post the suggestion for correlation here : Networking · Community (azure.com) (Azure Networking Feedback Hub).

Once done, I can also create internal traction.

And “Accept the answer” so that other community members can be aware of the current limitation.

Let me know if you have any questions on this.

Cheers,

Kapil
KapilAnanth-MSFT 38,041 Reputation points Microsoft Employee

2023-10-13T06:57:39.8666667+00:00

@Harsh Thakor

I am reaching out to check if you had a chance to review my last comment?

Were you able to create a Feedback item in Azure Feedback Hub - Networking · Community (azure.com) .

As this is a platform limitation/behaviour and the community answer provided was in fact highlighting the correct answer, I would request you to please consider Accepting their answer.

Should there be any further queries , please feel free to let me know.

Cheers,

Kapil
KapilAnanth-MSFT 38,041 Reputation points Microsoft Employee

2023-10-16T10:30:25.2466667+00:00

@Harsh Thakor

Just checking in to see if the below answer helped.

If this answers your query, please don’t forget to click "Accept the answer" and Up-Vote for the same, which might be beneficial to other community members reading this thread.

And, if you have any further query do let us know.

Thanks,

Kapil

1 answer

Thomas Meads 1,586 Reputation points

2023-10-03T15:54:52.6833333+00:00

Hi,

To my knowledge this is not possible without some custom logging. Application gateway has a x-appgw-trace-id header which is attached to every request and is logged in the diagnostic settings output (assuming you have this setup). You could then log this header when your application receives a request and join on this when querying.

When looking at application logs you will find a parent operation Id property and a operation Id property these are normally what are used to correlate between logs within an app. However I do not think that the parent Id of a request is automatically set to the trace headers sent by application gateway or AFD etc. I have not tested this though so it might be worth double checking this before setting up logging the x-appgw-trace-id header against requests to your app service.

Hope this helps.
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How To correlate requests between Azure Application Gateway and Azure App Service?

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