public List<ActiveGroupTracker> getFinishedActiveGroupTrackers() {
    return getActiveGroupTrackers().stream()
        .filter(groupTracker -> !groupTracker.isInFlight())
        .collect(Collectors.toList());
  }
@return iterates over all active group trackers and returns trackers which are not tracking
any remote replica group
ambry-replication/src/main/java/com/github/ambry/replication/continuous/DataNodeTracker.java