anchor.diff:  
   * Image layers that are no longer referenced by any images are removed as well.
   
  +[NOTE]
  +====
  +`--prune-over-size-limit` cannot be combined with `--keep-tag-revisions` nor
  +`--keep-younger-than` flags. Doing so will return an information that this
  +operation is not allowed.
  +====
  +
   To see what a pruning operation would delete:
   
  +. Keeping up to three tag revisions, and keeping resources (images, image
  +streams and pods) younger than sixty minutes:
  ++
  +====
   ----
   $ oadm prune images --keep-tag-revisions=3 --keep-younger-than=60m
   ----
  -
  -To actually perform the prune operation:
  +====
  +
  +. Pruning every image that exceeds defined limits:
  ++
  +====
  +----
  +$ oadm prune images --prune-over-size-limit
  +----
  +====
  +
  +To actually perform the prune operation for the previously mentioned options
  +accordingly:
   
   ----
   $ oadm prune images --keep-tag-revisions=3 --keep-younger-than=60m --confirm
  -----
  +
  +$ oadm prune images --prune-over-size-limit --confirm
  +----
  
positive.code: |Do not prune any image that is younger than `<duration>` relative to the
  current time. Do not prune any image that is referenced by any other object that
  is younger than `<duration>` relative to the current time. (default `60m`)
  |===
  
  {product-title} uses the following logic to determine which images and layers to
  
negative.code: - the `--keep-tag-revisions` most recent items in
   `*stream.status.tags[].items*`.
  
  * Remove any image "managed by {product-title}" (i.e., images with the annotation
  `*openshift.io/image.managed*`) that is exceeding the smallest xref:limits.adoc#image-limits[limit]
  defined in the same project and is not currently referenced by:
  - any running pods.
  - any pending pods.
  - any replication controllers.
  - any deployment configurations.
  - any build configurations.
  - any builds.
  
  * There is no support for pruning from external registries.
  
  * When an image is pruned, all references to the image are removed from all
  