How can i capture traffic in my web app on Azure ?

Karen 1

I have a App Service in an App Service plan. I have created a scale out for the web app, it is Manual Scale out configured to 4 instances.
How can i capture or retrieve how much traffic is hitting the web app instances and also how much traffic is being redirected to the scaled out instances ?

Thanks

1 answer

SwathiDhanwada-MSFT 18,556 Reputation points

2021-01-28T12:37:56.437+00:00
@Karen Thanks for your comment. Application Insights is a feature of Azure Monitor which you can use to monitor Request rates, dependency , page views and several others for your azure web app. After enabling Application Insights, you can query for traffic data for each cloud instance of web app. For instance, if you want to view the number of requests that the has been redirected to cloud instance of the Azure Web app, below kusto query will help in achieving the requirement.

requests | where timestamp > ago(24h) | summarize count() by name , cloud_RoleName , cloud_RoleInstance

Reference Articles :

-Application Insights
-Live Stream
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SwathiDhanwada-MSFT 18,556 Reputation points

2021-01-28T12:40:18.19+00:00

Or you can monitor your traffic using Live metrics tab with 1 second latency in Application Insights. Highlighted section in below image shows the server names or cloud instances of your web app.

Karen 1 Reputation point

2021-01-29T07:34:36.967+00:00

Brilliant thanks so much. Every day is a learning day. Just a few questions.

How long does a refresh take ? I do a number of GET requests but it takes a while for them to appear on the portal ?

Can I export the kusto query result to a table and import in sql ?

Can i run the query from sql at any time ?

Thanks

SwathiDhanwada-MSFT 18,556 Reputation points

2021-01-29T10:23:23.157+00:00

@Karen

Live Metrics has 1 second latency and shows the data of last 60 seconds. If the data is stored in Application Insights, you can set the retention period of the data and also you can create the charts from the kusto query and pin to dashboard. For data to appear in Application Insights , there will be a 5 min latency.

Yes you can export the data of kusto queries and import to sql.

Is there any business requirement to store the data in sql ?

Reference Articles :
Connect to Log Analytics using Azure Data Explorer
Export kusto data to sql

Karen 1 Reputation point

2021-01-30T06:25:52.183+00:00

I wanted to export the data to sql because i find i will be able to perform more detailed queries.

The other thing i found happening with Live Metrics is that if my app service , which is a .net api app doesnt receive any request, either GET,POST DELETE etc it seems to log that the HomeController was visited in the Live Metrics . Is that meant to happen ?

SwathiDhanwada-MSFT 18,556 Reputation points

2021-02-03T07:31:17.467+00:00

@Karen As mentioned in my previous comment, you can follow export kusto data to sql and query sql as per your requirement.

Normally, Request name is calculated as “VERB controller/action”. For example, requests with “/api/movies/” and “/api/movies/5” will be resulted in “GET movies”. If routing table is empty or doesn’t have “controller” - HttpRequest.Path will be used as a request name which in your case seems HomeController. This property doesn’t include domain name and query string.
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How can i capture traffic in my web app on Azure ?

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