The group commands are used to define, modify, and control groups.
group activate: Activate failure detector for server(s) in a group. By default the failure detector is deactivated.
group deactivate: Deactivate the failure detector for server(s) in a group.
group create: Create a group.
group remove: Remove a server from a group.
group add: Add a server to a group.
group lookup_servers: Return information on existing servers in a group.
group health: Check whether any server within a group has failed and report health information.
group destroy: Remove a group.
group demote: Demote the current master if there is one.
group promote: Promote a server to master.
group lookup_groups: Return information on existing groups.
group description: Update a group description.