False alarms can be a significant problem in highly available clusters of PostgreSQL. They can cause unnecessary downtime and disruptions that can impact the performance of the nodes.

pg_stat_statement is the essential extension that provides valuable insights into the query performance of a PostgreSQL database.

Network latency between nodes of a highly available PostgreSQL cluster can cause service disruptions and data loss.

Split brain is when a highly available system, such as a PostgreSQL cluster, becomes fragmented due to a network partition.

Triggers are a powerful tool in PostgreSQL. However, they can be a double-edged sword, causing confusion and performance issues if not used carefully.