FAQs "Attribute-based requests are currently not possible."

[Gladskih]

Could someone clarify that answer to "Can I restrict EC2 instance types?"?

Attribute-based requests are currently not possible.
You can select instances with special hardware, such as gpu

Does it mean that if my app needs to be run only on "c7i.2xlarge" I cannot achieve that using Karpenter?
But what's wrong with this:

apiVersion: karpenter.sh/v1
kind: NodePool
spec:
  template:
    spec:
      requirements:
        - key: node.kubernetes.io/instance-type
          operator: In
          values: ["c7i.2xlarge"]

?

[edmondceausu]

A list of "well known labels" can be found here and node.kubernetes.io/instance-type is present. However, listing a single instance would go against the best practices since it limits Karpenters ability to select the best node for efficiently placing pods.