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/// @startDocuBlock WalLogfileHistoricLogfiles
/// @brief maximum number of historic logfiles
/// `--wal.historic-logfiles`
///
/// The maximum number of historic logfiles that ArangoDB will keep after they
/// have been garbage-collected. If no replication is used, there is no need
/// to keep historic logfiles except for having a local changelog.
///
/// In a replication setup, the number of historic logfiles affects the amount
/// of data a slave can fetch from the master's logs. The more historic
/// logfiles, the more historic data is available for a slave, which is useful
/// if the connection between master and slave is unstable or slow. Not having
/// enough historic logfiles available might lead to logfile data being
/// deleted
/// on the master already before a slave has fetched it.
/// @endDocuBlock
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