Scaling is a complex topic because it can occur in two ways. With vertical scaling, I do not increase the number of instances of a service but migrate the service to the next higher-performance level. With horizontal scaling instead, I increase the number of instances.

The area scaling is covered on the Azure platform by the so-called Azure Autoscaling. Azure Autoscaling is one of the capabilities of the Azure Monitor service and works on a rule-based basis.

Let's take a closer look. I have already written that scaling is rule-based. But to be honest, that's just part of the reality. Before the autoscale engine can work, you need a complete configuration called Autoscale Settings, which consists of more than just rules.

Take a look at the following diagram: