QuorumMessage:
    | PingMessage
    | PongMessage
    | ActivateMessage
    | WorkMessage
    | JobMessage
    | ThrottleMessage
    | RollCallMessage
    | CronMessage

The types in this file are used to define those messages that are sent to hotmesh client instances when a new version is about to be activated. These messages serve to coordinate the cache invalidation and switch-over to the new version without any downtime and a coordinating parent server.