Manual:$wgRCEngines

Details
This variable is for configuring what engine classes will be used for what protocols when sending network updates for 1>Special:MyLanguage/Help:Recent changes|recent changes. See the main configuration variable,   for how to configure where recent changes information will be sent.

This variable was introduced as   and was renamed to   in MediaWiki 1.22 alpha.

Usage
This variable is an associated array mapping the URI protocol to the fully qualified class name that will handle that protocol.

This represents MediaWiki's built-in engine for sending RC updates over a UDP connection. More engines can be added by adding more keys or overriding existing ones.