Postgres Automated Failover

I am planning to use Postgresql with TimescaleDb extension. I have to design a system similar to AWS RDS which supports automated failover, transparent minor version upgrades etc.

In early days, I worked with PgPool II to enable heartbeat between the Postgres servers. Is there any new tool to achieve the same by which I can design a transparent failover system for Postgres?

Also is there any multi-master Postgresql solution? Is Postgres-XC production ready?

Any suggestions is appreciated. 

Thanks.