AWS Well-Architected Framework - Reliability Pillar, Amazon Web Services (AWS), 2024 (Amazon Web Services) - Describes best practices for building reliable and resilient systems on AWS, with guidance on HA, DR, and operational procedures.
PostgreSQL High Availability, Load Balancing, and Replication, The PostgreSQL Global Development Group, 2024 (PostgreSQL Documentation) - Documentation explaining HA, replication, and load balancing configurations for PostgreSQL, relevant for metadata stores.