DatastoreKeyInfo¶
This 
DatastoreKeyInfo struct is used to represent information related to specific keysProperties¶
number CreateAt¶
SERVER ONLY 
The creation time of the key, in seconds
number UpdateAt¶
SERVER ONLY 
The last time that the key was updated, in seconds
string Version¶
SERVER ONLY 
The version of the key
string Metadata¶
SERVER ONLY 
The metadata associated with the key