The Process Killer attack is a technique used to enhance system resilience by deliberately terminating or disrupting processes in order to test a system's ability to detect and recover from such failures. This method involves sending signals, such as SIGKILL or SIGTERM, to chosen processes using various parameters like process ID, name, or user ID, and can be applied to processes running in containers and Kubernetes Pods. The attack's magnitude and blast radius depend on the scope of the targeted processes and the intensity of the signals sent. By simulating process failures, organizations can validate the effectiveness of their monitoring and recovery tools, ensuring high availability and reducing the risk of downtime. Practitioners are advised to start with minimal impact by targeting non-essential processes and to use monitoring tools to observe the effects. This approach helps in identifying potential system vulnerabilities and assessing how quickly and effectively systems can recover, ultimately improving the reliability of applications and services.