The Horizontal Pod Autoscaling (HPA) feature, which was introduced in Kubernetes v1.2, allows users to autoscale their applications off of basic metrics like CPU, accessed from a resource called metrics-server.
With Kubernetes v1.6, it became possible to autoscale off of user-defined custom external metrics collected from within the cluster.
New Relic metric adapter is only available for Kubernetes v1.16 and above. To see the list full of requirements check the following link.
By using Helm charts any New Relic user can easily install our Kubernetes integration with HPA or simply update it to enable the New Relic metric adapter.
Find more information about the installation process here.