-"derive-dropped" I<type>-I<type instance> : the number of elements dropped. If
-this value is nul, either everything is going well or you set
-B<WriteQueueLimitLow>/B<WriteQueueLimitHigh> too high. If this value is not nul
-too often, either you set B<WriteQueueLimitLow>/B<WriteQueueLimitHigh> too low
-or you have a serious problem.
+The number of metrics currently in the write queue. You can limit the queue
+length with the B<WriteQueueLimitLow> and B<WriteQueueLimitHigh> options.