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Mark
Asked: 2021-06-16 04:40:21 +0800 CST

What is the unit of measure for timeTaken_d in Azure diagnostics?

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I want to get a list of all requests that are taking longer then 2 seconds and I think this is correct as the timeTaken_d appears to be a floating point and would seem to be in seconds.

AzureDiagnostics
| where ResourceType == "APPLICATIONGATEWAYS" and OperationName == "ApplicationGatewayAccess" and timeTaken_d  > 2
| project TimeGenerated, host_s, requestUri_s, httpStatus_d, backendPoolName_s, serverRouted_s, timeTaken_d 
| order by TimeGenerated desc

However, I have seen elsewhere that this measure is in milliseconds.

Does anyone know for sure? Better still, can someone point me at the docs?

azure azure-monitor

3 Answers

  1. It's in milliseconds, as per this document.

    timeTaken: Length of time (in milliseconds) that it takes for a request to be processed and its response to be sent. This is calculated as the interval from the time when Application Gateway receives the first byte of an HTTP request to the time when the response send operation finishes. It's important to note that the Time-Taken field usually includes the time that the request and response packets are traveling over the network.

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  2. The time in timeTaken_d field is measured in milliseconds.

    The requested info is under "analyzing the Logs" section in below document -

    https://cbeveridge.co.uk/2020/03/07/troubleshooting-azure-gateway-web-application-firewall-waf-logs/

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  3. I had the same question as Mark and found the documentation provided by Sam helpful. However I wanted to point out that timeTaken_d is reported in different units for WAF_v1 (milliseconds) and WAF_v2 (seconds). In Azure Portal you can see what tier you're on by looking at the Configuration section of your Application Gateway.

    https://docs.microsoft.com/en-us/azure/application-gateway/application-gateway-diagnostics#for-application-gateway-and-waf-v2-sku

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