NewBulkOracle returns an oracle for planning bulk operations, which will plan balancing randomly across all replicas (if follower reads are enabled).

ClosedTimestampPropagationSlack is used by follower_read_timestamp() as a measure of how long closed timestamp updates are supposed to take from the leaseholder to the followers.

StreakConfig controls the streak-preferring behavior of oracles that support it, such as the bulk oracle, for minimizing distinct spans in large plans.