Get or set user metadata. Metadata is expressed as a list of key-values pair. The key of an Atmos user's metadata can be either listable or non-listable. The listable metadata may be listed by its key, or tag.
| Resource | Description |
| GET /rest/namespace/path?{metadata/user} | Returns the user metadata associated with the specified object |
| GET /rest/namespace/path?{metadata/user} | Returns the user metadata associated with the specified object |
| POST /rest/namespace/path?{metadata/user} | Writes user metadata into the object |
| POST /rest/objects/objectID?{metadata/user} | Writes user metadata into the object |
| DELETE /rest/objects/objectID?{metadata/user} | Delete user metadata for the specified object |