The last slide mentions automatically failover is still needed. For that, look into DRDB + HeartBeat on Linux. They allow you to build automatically failover

The last slide mentions automatically failover is still needed. For that, look into DRDB + HeartBeat on Linux. They allow you to build automatically failover cluster easily. In my past life, I've built high available MySQL cluster using the combo and it worked great. The same technique can be applied to Postgres.