Histórico de conversas no Servidor

Como habilito para salvar o histórico de conversas do Spark no Servidor OpenFire ?

Utilizo essa versão → Openfire 4.8.0, build 89722b7

You can install and configure the Monitoring Service plugin for Openfire to retain a history of chat messages.

Note that current versions of Spark do not retrieve message history from the server. They store messages locally.