pub fn retained_tail_progress(
dir: &Path,
expected_identity: SegmentIdentity,
since_lsn: u64,
requested_through_lsn: u64,
) -> Result<RetainedTailProgress>pub fn retained_tail_progress(
dir: &Path,
expected_identity: SegmentIdentity,
since_lsn: u64,
requested_through_lsn: u64,
) -> Result<RetainedTailProgress>