надо тестить!

http://pgbouncer.github.io/2015/08/pgbouncer-1-6/

для себя отметил:

https://github.com/pgbouncer/pgbouncer/blob/master/NEWS
2015-08-01 - PgBouncer 1.6 - "Zombies of the future"
"Zombies of the future"
–
* Pooling mode can be configured both per-database and per-user.
* Per-database and per-user connection limits: max_db_connections and max_user_connections.
* Add DISABLE/ENABLE commands to prevent new connections.
* Show remote_pid in SHOW CLIENTS/SERVERS. Available for clients that connect over unix sockets and both tcp and unix socket server. In case of tcp-server, the pid is taken from cancel key.
* Add separate config param (dns_nxdomain_ttl) for controlling negative dns caching.
* Add the client host IP address and port to application_name. This is enabled by a config parameter application_name_add_host which defaults to 'off'.
–
* Fix cancellation of of waiting clients.
* Don't allow new server connections when PAUSE <db> was issued.
–
Pavel Stehule
Andrew Dunstan
Magnus Hagander
Heikki Linnakangas
Peter Eisentraut
Marko Kreen
...

Misha Tyurin,

PgBouncer 1.7.x
https://pgbouncer.github.io/changelog.html#pgbouncer-17x

"Colors Vary After Resurrection"

* Support Host Based Access control file, like pg_hba.conf in Postgres.