def connect(conn)
      start = Time.now
      conn.connect
      @latency = Time.now - start
      @down_at = nil
      true
    end
def connect(conn)
      start = Time.now
      conn.connect
      @latency = Time.now - start
      @down_at = nil
      true
    end
Connect the node on the underlying connection.

 @example Connect the node.
   node.connect

 @raise [ Errors::ConnectionFailure ] If connection failed.

 @return [ true ] If the connection suceeded.

 @since 2.0.0