What is the use of pconn_use_lmt?

  Pconn_use_lmt specifies the maximum number of requests per
  connection. By default Polygraph does not use persistent HTTP
  connections, i.e. every connection is closed after transaction is
  completed and each new transaction opens a new connection. Setting
  pconn_use_lmt to, say, const(10) would make Polygraph use HTTP
  persistent connections and limit the number of requests per connection
  to 10. If persistent connection use limit is not reached after
  transaction completes, the connection is put into idle queue. Next
  transaction that needs a connection to the same destination would use
  the idle connection instead of opening a new one.