[jira] [Created] (FLINK-10969) expose API or metric for total number of keys stored in state backend

[Steven Zhen Wu (JIRA)]

Steven Zhen Wu created FLINK-10969:
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             Summary: expose API or metric for total number of keys stored in 
state backend
                 Key: FLINK-10969
                 URL: https://issues.apache.org/jira/browse/FLINK-10969
             Project: Flink
          Issue Type: New Feature
          Components: State Backends, Checkpointing
            Reporter: Steven Zhen Wu


[~srichter] mentioned it might make sense to provide two versions: exact count 
and approximate count. For some state backend (likes rocksDB), it may be much 
cheaper to get approximate count.



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