System metadata is automatically associated with each object stored in the object store. Some system metadata is always populated and can be used as index keys, other metadata is not always populated but, where present, can be returned with metadata search query results.
System metadata
Table 1. System Metadata The system metadata listed in the table below can be used as keys for metadata search indexes.
Name (Alias)
Type
Description
ObjectName
string
Name of the object.
Owner
string
Identity of the owner of the object.
Size
integer
Size of the object.
CreateTime
datetime
Time at which the object was created.
LastModified
datetime
Time and date at which the object was last modified.
NOTE: Modification supported by ECS S3 byte-range update extensions, not by pure S3 API.
Optional metadata attributes
Optional system metadata attributes may or may not be populated for an object, but can be optionally returned along with search query results. The optional system metadata attributes are listed in the table below.