kube-scheduler-simulator is a tool developed for simulating the Kubernetes scheduler's behavior and decisions.It allows users to test scheduling constraints, configurations, and custom plugins.The tool aims to help users understand the scheduler's inner workings and define appropriate scheduling constraints.It offers a way to create a simulated cluster environment to test the scheduler without affecting real workloads.Users can inspect the scheduler's internal decisions and see how plugins influence Pod scheduling.Integrating custom plugins or extenders into the simulator's debuggable scheduler is supported.The simulator allows users to test new scheduler versions in a production-like environment before deployment.Use cases include examining scheduling constraints, assessing cluster behavior with configuration changes, and testing custom plugins.Getting started with the simulator only requires Docker installation, and no Kubernetes cluster is needed.Contributions and feedback for the kube-scheduler-simulator are welcome on the GitHub repository maintained by Kubernetes SIG Scheduling.