The z-axis is very similar to the x-axis when it comes to scalability structure, as it distributes exactly the same code on each server. The big difference is that each server responds to a specific subset of data. In this strategy, the search is providing not only scalability regarding the application, but also the data you use.

The following diagram shows a little example:

This strategy is not entirely ruled out when it comes to microservices, but its use is a little different. The applicability ends up not being on the verbs, but on geolocation. This means that, in a global application, the database of a microservice is distributed by region and is  preferably available for this region, that is, people who access the website in Europe will, preferably, see the European news.

The definition of how microservices are scaled is directly linked to business strategy. From a technical point of view, the focus is to provide a flexible software strategy allowing changes as they certainly occur.