flowStats = new FlowStatsTracker(flowStatsService, this, lifetimeNanos);
flowTableStats = new FlowTableStatsTracker(flowTableStatsService, this, lifetimeNanos);
groupDescStats = new GroupDescStatsTracker(groupStatsService, this, lifetimeNanos);
flowStats = new FlowStatsTracker(flowStatsService, this, lifetimeNanos);
flowTableStats = new FlowTableStatsTracker(flowTableStatsService, this, lifetimeNanos);
groupDescStats = new GroupDescStatsTracker(groupStatsService, this, lifetimeNanos);