Horizontal Pod Autoscaling
With Horizontal pod autoscaling, Kubernetes automatically scales the number of pods in a deployment or replication controller based on observed CPU utilization or on some other application provided metrics.
The Horizontal Pod Autoscaler is implemented as a Kubernetes API resource and a controller. The resource determines the behavior of the controller. The controller periodically adjusts the number of replicas in a replication controller or deployment to match the observed average CPU utilization to the target specified by user.
To make it work, the definition of pod resource consumption needs to be specified.