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implemented "jump" feature to values starting with "_ " (v2)
In etcd v2, keys or directories that begin with an underscore (_) are considered hidden.
When a GET request is made to retrieve the contents of a directory, these hidden items will not be included in the returned list. This feature allows for storing metadata or other internal information without it being explicitly listed alongside the visible key-value pairs or subdirectories.
For example, if you have a directory /my_dir and you create a key /my_dir/_hidden_key, a GET request to /my_dir would return all other keys and subdirectories within /my_dir but would omit hidden_key from the listing.
v2, keys starting with the underscore character () are reserved for internal or special purposes, such as the discovery protocol. The documentation for etcd v2 specifically mentions this convention for the discovery service.