Azure Feature Exposure Control (AFEC) provides a mechanism for the resource providers to control feature exposure to users. Resource providers typically use this mechanism to provide public/private preview for new features prior to making them generally available. Users need to explicitly register for AFEC features to get access to such functionality.
Azure resources can be linked together to form logical relationships. You can establish links between resources belonging to different resource groups. However, all the linked resources must belong to the same subscription. Each resource can be linked to 50 other resources. If any of the linked resources are deleted or moved, the link owner must clean up the remaining link.
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