@Override
  public void logTransition(GraphType type, Object graphName, Object edgeName, Object state,
      Object source, Object dest) {
    if (isEnabled(type)) {
      Transition edge = new Transition(type, graphName, edgeName, state, source, dest);
      edges.add(edge);
    }
  }
Should be invoked when GemFire cache is closing or closed.
geode-core/src/main/java/org/apache/geode/internal/sequencelog/SequenceLoggerImpl.java