The following key points will give you more information about App Service plan autoscaling:
- You cannot assign more than one autoscale setting to one resource.
- When you have more than one instance, the threshold will be calculated according to the average of the metric across all of the instances. This is done to decide whether to scale out/in.
- If you want to investigate an autoscale operation failure, you can use the activity log.
- Make sure that you have different values for the minimum and the maximum number of instances with a reasonable margin.
- If you have manually scaled out/in at the same time that you have autoscale rules, the autoscale rules will overwrite the manual scaling you have ...