code: func (o *ReplicationControllerOptions) AddFlags(fs *pflag.FlagSet) {
  	if o == nil {
  		return
  	}
  
  	fs.Int32Var(&o.ConcurrentRCSyncs, "concurrent_rc_syncs", o.ConcurrentRCSyncs, "The number of replication controllers that are allowed to sync concurrently. Larger number = more responsive replica management, but more CPU (and network) load")
  }
docs: // AddFlags adds flags related to ReplicationController for controller manager to the specified FlagSet.