PgBouncer 1.9.0 is out. It contains several new features to facilitate and monitor controlled switchover in high-availability architectures. There are also a number of documentation improvements and fixes. See
https://pgbouncer.github.io/2018/08/pgbouncer-1-9-0
for more information, the detailed changelog, and download links.
PgBouncer is a lightweight connection pooler for PostgreSQL.