Azure Metrics and Azure Logs not same values

Hermann Magliacane 11

Hi,

I'm not understanding why if I use "Azure Metrics" -> add metric -> filter from 01st Jan 2025 to 13th Jan 2025 I see 174M of requests

and if I use "Azure Logs" quering AppRequests via KQL I just retrive 21M of request.

Any Suggest?

What's wrong?

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1 answer

Stanislav Zhelyazkov 25,406 Reputation points MVP

2025-01-14T07:45:55.5333333+00:00
Hi,

I think the issue comes with something called Sampling in Application Insights. The correct way to count the number of requests in AppRequests table is:

AppRequests | summarize totalCount=sum(ItemCount)

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Hermann Magliacane 11 Reputation points

2025-01-14T08:47:25.2766667+00:00

Not solved

Stanislav Zhelyazkov 25,406 Reputation points MVP

2025-01-14T12:15:40.0733333+00:00

Overall you will never be able to get the exact number on both. They will be close but not exact. Sampling can happen inside or outside of the time window you have specified and depending on that will count or not. Additionally as far as I can understand you are checking number of request on Azure Web App and data in Log Analytics. If you have multiple web apps sending requests data to the Log Analytics workspace you need to modify the query to filter on requests only for that app.

Hermann Magliacane 11 Reputation points

2025-01-14T14:46:02.8233333+00:00

Thanks for your answer,

but it's hard for me belive that 23M is closer to 187M and I don't understand why

187M is the result of request to the single webapp via "Azure Metrics"

23M is the result of request to the

the period is for both from 01st Jan to 14th Jan
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Azure Metrics and Azure Logs not same values

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