Manual:$wgBotPasswordsCluster

Details
Define the cluster name for the bot_passwords table for use with the new bot authentication system. If set to " ", the regular cluster will be used. Note that must be set to " " (which is the default) for this to work.

The goal of this variable is to support cross-wiki sharing of bot passwords: the bot_passwords table references users by their central IDs so only one instance of the table should exist in the whole wikifarm.

This configuration parameter was introduced in  ().