@classmethod
  def _set(cls, context):
    cls._context_instance = context
Fetch metadata about each RRD in this Cacti DB, returning a list of
dataset/ETHPy150Open livid/v2ex/mapreduce/context.py/Context._set--crossover with--dataset/ETHPy150Open serverdensity/sd-agent/checks.d/cacti.py/Cacti._fetch_rrd_meta