A container that watches over another container in a deployment and vertically scales the dependent container up and down based on the number of nodes in the cluster.
The Kubernetes Addon Resizer (also known as pod_nanny or addon-resizer) is a container that watches over another container in a deployment and vertically scales the dependent container up and down. It scales resources linearly based on the number of nodes in the cluster.
The addon-resizer is commonly used as a sidecar container with Kubernetes addons such as metrics-server, heapster, and kube-state-metrics to automatically adjust resource allocations based on cluster size.