Kubernetes Custom Metric Autoscalers

KEDA is a Kubernetes event-driven autoscaler and cloud event scaling engine. It functions as a custom metrics provider that monitors external event sources—including message brokers, databases, and cloud metrics—to dynamically adjust the replica counts of containerized workloads. The project is distinguished by its scale-to-zero workflow, which reduces workloads to zero replicas during inactivity and automatically restarts them when new events are detected. It operates as a multi-cloud event trigger system, using a pluggable scaler interface to integrate with a wide array of third-party servi

Metrics Server is a lightweight, single-purpose daemon that collects CPU and memory usage data from every node and pod in a Kubernetes cluster and exposes those metrics through a standard Kubernetes API endpoint. It registers as an aggregated extension API server behind the Kubernetes apiserver, making resource utilization data available to the Horizontal Pod Autoscaler and Vertical Pod Autoscaler for automatic replica count and resource request adjustments. The project distinguishes itself by operating as a focused, in-cluster resource metrics collector that polls kubelet summary endpoints a

Agones is a Kubernetes game server orchestrator designed for hosting, scaling, and managing dedicated multiplayer game servers. It extends the Kubernetes control plane using custom resource definitions to define game server and fleet objects, utilizing a dedicated fleet manager to maintain pools of warm server instances. The system provides a game server SDK and language-specific client libraries that allow server processes to signal readiness, health, and shutdown states directly to the controller. It distinguishes itself through specialized scaling logic, including the use of WebAssembly mo