When we want to remove a meter, the meter subsystem changes the related meters' state to PENDING_REMOVE. (That's fine) At this point, if the meter subsystem receives a meter_stats_reply, it updates the meter state from PENDING_REMOVE to ADDED. So, the meter subsystem doesn't send the METER_REMOVED event, and the OLT application doesn't work properly. Also, the OLT app receives multiple METER_REMOVED events if everything goes fine on the meter subsystem.