Geo: Support a Patroni cluster for the tracking database

Geo deployment specifications

Primary site

• Multi-node [add # and types of non-PG nodes]
• Patroni cluster or single node? [add details]

Secondary site

• Multi-node [add # and types of non-PG nodes]
• Tracking database Patroni cluster [add details]
• Patroni cluster or single node? [add details]

Testing

• Database replication from the primary site to the secondary site during typical (i.e. non-failover) operation: run Geo end-to-end tests
• Database migrations (are there tracking database migrations?)
• PG failover of tracking database Patroni cluster on secondary site (procedure? data loss concerns during failover? check replication after failover)