NetScaler ADM now allows you to associate your NetScaler instances with tags. A tag is a keyword or a one-word term that you can assign to an instance. The tags add some additional information about the instance. The tags can be thought of as metadata that helps describe an instance. Tags allow you to classify and search for instances based on these specific keywords.
You can also assign multiple tags to a single instance.
https://docs.netscaler.com/en-us/citrix-application-delivery-management- service/networks/instance-management/create-tags.html