Add a deprecation document detailing signature store removal
Signed-off-by: Richard Scothern <richard.scothern@docker.com>master
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				|  | @ -24,7 +24,7 @@ storage: | |||
|     cache: | ||||
|         blobdescriptor: redis | ||||
|     filesystem: | ||||
|         rootdirectory: /var/lib/registry | ||||
|         rootdirectory: /var/lib/registry-hello-world-clean | ||||
|     maintenance: | ||||
|         uploadpurging: | ||||
|             enabled: false | ||||
|  |  | |||
|  | @ -0,0 +1,24 @@ | |||
| <!--[metadata]> | ||||
| +++ | ||||
| title = "registry deprecation" | ||||
| description = "describes deprecated functionality" | ||||
| keywords = ["registry, manifest, images, signatures, repository, distribution, digest"] | ||||
| +++ | ||||
| <![end-metadata]--> | ||||
| 
 | ||||
| # Docker Registry Deprecation | ||||
| 
 | ||||
| This document details functionality or components which are deprecated within | ||||
| the registry. | ||||
| 
 | ||||
| ### v2.5.0 | ||||
| 
 | ||||
| The signature store has been removed from the registry.  Since `v2.4.0` it has | ||||
| been possible to configure the registry to generate manifest signatures rather | ||||
| than load them from storage.   In this version of the registry this becomes | ||||
| the default behavior.  Signatures which are attached to manifests on put are | ||||
| not stored in the registry.  This does not alter the functional behavior of | ||||
| the registry. | ||||
| 
 | ||||
| Old signatures blobs can be removed from the registry storage by running the | ||||
| garbage-collect subcommand. | ||||
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