HAProxy stats page does not update when new server is added/removed via dataplane API

I am using dataplane api to dynamically add/remove backend servers. I was expecting haproxy stats to update accordingly with new haproxy config version generated by dataplane API. Am i missing something here? Please advice. Below is dataplane config used in haproxy -

  host = "0.0.0.0"
  port = 5555

  user "randomuser" {
    insecure = true
    password = "randompass"
  }

  transaction {
    transaction_dir = "/tmp/haproxy"
  }
}

haproxy {
  config_file = "/etc/haproxy/haproxy.cfg"
  haproxy_bin = "/usr/sbin/haproxy"

  reload {
    reload_cmd  = "service haproxy reload"
    restart_cmd = "service haproxy restart"
    reload_delay = "5"
  }
}