The OPA Gatekeeper parameterized policy library helps define and govern organizations Kubernetes environment. The policies applied within OPA Gatekeeper define user capabilities on the cluster and cluster compliancy with an organization’s policies. These policies are enforced efficiently by utilizing the Custom Resource Definitions (CRDs) and Rego.
OPA Gatekeeper library is extensive and provides a plethora of constraint templates as well as examples to utilize within Gatekeeper.
Here is more information on Gatekeeper policy library. The majority of the constraint templates in this repo have been derived from this library.