Azure App Service Load Balancing "SiteLoadBalancing.LeastRequests" is "Least Active Requests"?

The Azure App Service load balancing setting "SiteLoadBalancing.LeastRequests" is the "Least Active Requests" algorithm, right? https://learn.microsoft.com/en-us/dotnet/api/microsoft.azure.powershell.cmdlets.websites.support.siteloadbalancing.leastrequests?view=az-ps-latest

SiteLoadBalancing.LeastRequests

Am I understanding that correctly?

https://learn.microsoft.com/en-us/answers/questions/2121068/azure-app-service-load-balancing-siteloadbalancing https://learn.microsoft.com/en-us/answers/questions/2121068/azure-app-service-load-balancing-siteloadbalancing

Solution

The Azure App Service load balancing setting "SiteLoadBalancing.LeastRequests" is the "Least Active Requests" algorithm, right?

Yes, you are correct. The Azure App Service load balancing setting SiteLoadBalancing.LeastRequests corresponds to the "Least Active Requests" algorithm.

It sends traffic to the server with the least number of active requests, helping to balance the load evenly across servers.
Please refer this doc for better understanding about load balancing.

To set the load balancing to SiteLoadBalancing.LeastRequests

Go to your Azure App Service - >Environment variables - > add below environment variable.

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To test the load balancing behavior

Go to your azure app service - > click on scale out (app service plan) -> Increase the instance count to more than one

Use Application Insights to observe the load distribution across your instances.
You can also view metrics in your App Service, as following

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