anchor.diff:  |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`)
  +
  +.^|`--prune-over-size-limit`
  +|Prune each image that exceeds the smallest xref:limits.adoc#image-limits[limit]
  +defined in the same project. This flag cannot be combined with `--keep-tag-revisions`
  +nor `--keep-younger-than`.
   |===
   
   {product-title} uses the following logic to determine which images and layers to
  
positive.code: 
  == Pruning Images
  
  In order to prune images that are no longer required by the system due to age
  and status, administrators may run the following command:
  
  ----
  $ oadm prune images [<options>]
  
negative.code: 
  * 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
  ----
  ====
  
  . 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
  ----
  