Driver Implementation ##################### Topk result: - *topk*: a sorted list of a topk item - *statistics*: (optional) query result statistics. - *additional_series*: (optional) a list of additional series (e.g. the *total series*). Topk item: - *tags*: a map tag_name -> tag_value - *value*: the integral value for the topk item on the specified time range A timeseries driver must implement the API described below. .. doxygenfile:: driver.lua.cpp