Do i need to pay twice the monthly charges (56$/month) if I "scale out" my basic service plan to 2 instances ? Or price is inclusive up to 3 instances ?
You'll be charged per instance when you scale out. So two instances will be $112/month, and three will be $168/month.
As Rob Reagan mentioned that it will be charged per instance. We can get the price via azure pricing calculator. More details please refer to the screenshot.
If you are not going to use the 3 capabilities full time, program the horizontal scale of your service to use at least 1 to 3 instances when you reach a certain parameter you can choose. This way you will pay for the additional machines only for as long as they are needed.
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