OODA stands for observe, orient, decide, and act specifically to secure cloud-native deployments and prevent breaches before they occur. A Kubernetes controller: Monitors the current state and compares that to expectations (that is, the state that the user has defined for this resource, perhaps through a YAML file). Decides: Determines whether any resources need to be added or taken away; acts to constantly bring the number of pods in line with expectations. The controller checks how many pods there are, and whether that number matches the replica count for that deployment.”]