GKE uses add-on resizer to scale the metrics-server add-on and the heapster add-on. The add-on resizer scales the resource requests and resource limits of its managed containers in proportion to the number of nodes in the cluster. using the following formula:

$$R=b+m \times \max(n,16)$$

Where the resource request or limit, $$R$$, is equal to the base request/limit, $$b$$, plus the marginal resource requirement, $$m$$, times the node count of the cluster, $$n$$.

If the cluster has 16 or fewer nodes, add-on resizer will assign resources as if the cluster has 16 nodes.

## What's next

Fine tune the resources used by cluster add-ons