confd directory contains haproxy and pgbouncer template files for the confd -- lightweight configuration management tool
You need to copy content of confd directory into /etcd/confd and run confd service:
$ confd -prefix=/service/$PATRONI_SCOPE -backend etcd -node $PATRONI_ETCD_URL -interval=10It will periodically update haproxy.cfg and pgbouncer.ini with the actual list of Patroni nodes from etcd and "reload" haproxy and pgbouncer.ini when it is necessary.
startup-scripts directory contains startup scripts for various OSes and management tools for Patroni.