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* Statistics used in deciding when to take a snapshot.
* The latest good snapshot covers entries 1 through lastSnapshotIndex (inclusive).
* The size in bytes of the last snapshot.
* The index of the first entry in the log (whether or not this entry exists).
* The index of the most recent entry in the log, or logStartIndex - 1 if the log is empty.
* The size in bytes of the log.
* Whether the server is currently the cluster leader.