Add high level overview comments on ledger_cleanup_service (#24184)
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//! The `ledger_cleanup_service` drops older ledger data to limit disk space usage
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//! The `ledger_cleanup_service` drops older ledger data to limit disk space usage.
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//! The service works by counting the number of live data shreds in the ledger; this
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//! can be done quickly and should have a fairly stable correlation to actual bytes.
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//! Once the shred count (and thus roughly the byte count) reaches a threshold,
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//! the services begins removing data in FIFO order.
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use {
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crossbeam_channel::{Receiver, RecvTimeoutError},
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