"description":"key is an array of values (though a single value is treated as a one-element array), to form a heirarchy. Using the first element of the key as the plugin name (e.g. [ 'summary' ]) is recommended. A key can either have children or a value, never both: parents are created and removed automatically.",
"items":{
"type":"string"
}
},
"generation":{
"type":"u64",
"description":"If specified, means that the update will fail if the previously-existing data is not exactly that generation. This allows for simple atomicity. This is only legal with mode “must-replace” or “must-append”."