Lack of Chapter About Karaf Failover Deployments

Although Fuse 7.7 karaf runtime has karaf.lock mechanism, there is no document for it.
There is one for Fuse 6.x as follows:
https://access.redhat.com/documentation/en-us/red_hat_jboss_fuse/6.3/html/configuring_and_running_jboss_fuse/esbruntimefailover