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I have installed Sitecore in Azure PaaS. In App_Config\include folder I can see there are a lot of config files name started with "zzz". Can anyone please tell me what is these files are for? Are those any configs creating by any job?

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There are probably hundreds of examples where using the z prefix can be seen. This is a convention followed to ensure that the patch is applied last.

Before Sitecore 9, using a folder or a file prefix with z was the best way to get your changes applied in the desired order.

After Sitecore 9, there was introduced a new feature to apply configuration changes based on the role of the instance running.

The best approach is to use a folder to contain your patches and only use the z notation when you are finding it difficult to override an existing setting.

A good example might be a pre-existing configuration is contained in a folder called Foundation/C and you initially stored your override in a folder called Foundation/A. You then proceed to rename the A folder to Z. Now everything in your z folder will be applied after the C folder.

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