@property
  def instances(self):
    with self._condition:
      return set(self._instances)
``log_list_volumes`` increments the count field of log messages.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/tools/devappserver2/server.py/BasicScalingServer.instances--crossover with--dataset/ETHPy150Open ClusterHQ/flocker/flocker/node/agents/test/test_blockdevice.py/LogListVolumesTest.test_generates_log_with_incrementing_count