Horizontal Pod Autoscaler
Horizontal Pod Autoscaler (HPA) is a Kubernetes resource that automatically scales the number of pod replicas in a deployment, replica set, or stateful set based on observed CPU utilization or custom metrics. It adjusts the replica count to maintain target performance levels, ensuring applications can handle varying loads efficiently. HPA is a core component of Kubernetes' autoscaling capabilities, enabling dynamic resource management in cloud-native environments.
Developers should use HPA when running applications on Kubernetes that experience fluctuating traffic or workloads, such as web services, APIs, or microservices, to ensure high availability and cost-efficiency. It helps prevent over-provisioning by scaling down during low demand and scaling up during peaks, reducing operational costs and improving responsiveness. HPA is particularly valuable in production environments where manual scaling is impractical due to rapid load changes.