add cloud load balancer plugin

    status ok
    metric load_balancer_01.status float 100.0
    metric load_balancer_01.incoming int 0
    metric load_balancer_01.incoming_ssl int 0
    metric load_balancer_01.outgoing int 0
    metric load_balancer_01.outgoing_ssl int 0
    metric load_balancer_01.total_nodes int 1
    metric load_balancer_01.online_nodes int 1
    metric load_balancer_01.offline_nodes int 0
    metric load_balancer_01.draining_nodes int 0
    metric load_balancer_01.connect_timeout int 0
    metric load_balancer_01.connect_error int 0
    metric load_balancer_01.connect_failure int 0
    metric load_balancer_01.data_timed_out int 0
    metric load_balancer_01.keep_alive_timed_out int 0
    metric load_balancer_01.max_conns int 5