This information is probably located in one of the docs but didn't find it in anything I've read just now. Under normal circumstances current data rolls in and rolls out based on any number of parameters such as frozenTimePeriodInSecs. What happens when you ingest a bunch of historical data though and how does that impact retention? If the retention is strictly sized based it is one thing but time based seems to be another. My gut says this would be based on indexed time but not sure how historical data and timestamps play into bucket creation.
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