How to track the last flush time of a table externally

[Youngjoon Kim]

Hi,
 
In HBASE-12859, API to track the last major compaction time of a table was 
added. I need a similar feature for the last flush time.
HRegion class has getEarliestFlushTimeForAllStores method, but It cannot be 
used outside of a region server.
Is there any way to track the last flush time of a table externally?
 
Thanks,
Youngjoon