/**
     * gets a cached Monitor per name. If the monitor is not found and createFromSeed is false,
     * it will return none. If createFromSeed is true, it will try to look up the last known
     * servers list for this set and will create a new monitor using that as the seed list.
     */
    static std::shared_ptr<ReplicaSetMonitor> get(const std::string& name);