Open Policy Agent — A great alternative for Pod Security Policy

The Kubernetes PodSecurityPolicy (PSP) is the earliest reliable security control offered out-of-the-box with Kubernetes. It’s merely an Admission Controller which ensures deployed Pods meet the defined security level for a Kubernetes cluster. Unfortunately, PSP is still in Beta, is getting deprecated in the next Kubernetes release (Kubernetes 1.21), and will be entirely removed in Kubernetes 1.25.