surafel58 commented on PR #11827:
URL: https://github.com/apache/seatunnel/pull/11827#issuecomment-5317719170

   Done in 5d809f69. Expanded the prepareCommit() comment to state the 
idempotency assumption (a failed checkpoint flush replays from the last 
successful checkpoint on restart, which is safe because Prometheus remote-write 
is an idempotent upsert keyed by (labels, timestamp)) and to note that 
returning Optional.empty() is the non-2PC use of this hook, matching the 
sibling sinks. Comment-only change, no behavior change.


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