[jira] [Created] (KAFKA-20473) KIP-892: Wire uncommitted bytes through metered store wrappers and add metric

[Bill Bejeck (Jira)]

Bill Bejeck created KAFKA-20473:
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             Summary: KIP-892: Wire uncommitted bytes through metered store 
wrappers and add metric
                 Key: KAFKA-20473
                 URL: https://issues.apache.org/jira/browse/KAFKA-20473
             Project: Kafka
          Issue Type: Sub-task
            Reporter: Bill Bejeck


Add uncommitted-state-bytes gauge metric and wire 
approximateNumUncommittedBytes() through all metered wrappers.

- StateStoreMetrics.java — new uncommitted-state-bytes gauge
- MeteredKeyValueStore, MeteredSessionStore, MeteredWindowStore, 
MeteredVersionedKeyValueStore
- Headers-enabled metered wrappers (KIP-1271):
  - MeteredTimestampedKeyValueStoreWithHeaders
  - MeteredTimestampedWindowStoreWithHeaders
  - MeteredSessionStoreWithHeaders



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