ImageContentSourcePolicy in OpenShift

ImageContentSourcePolicy (ICSP) 

https://docs.openshift.com/container-platform/4.9/openshift_images/image-configuration.html#images-configuration-registry-mirror_image-configuration

ICSP is used to redirect request to a registry to its mirror. 

apiVersion: operator.openshift.io/v1alpha1

kind: ImageContentSourcePolicy

metadata:

  name: ubi8repo

spec:

  repositoryDigestMirrors:

  - mirrors:

    - example.io/example/ubi-minimal 

    source: registry.access.redhat.com/ubi8/ubi-minimal 

  - mirrors:

    - example.com/example/ubi-minimal

    source: registry.access.redhat.com/ubi8/ubi-minimal

  - mirrors:

    - mirror.example.com/redhat

    source: registry.redhat.io/openshift4 

Just for reference: 
https://docs.openshift.com/container-platform/4.9/rest_api/operator_apis/imagecontentsourcepolicy-operator-openshift-io-v1alpha1.html