Configure tcp_keepalives settings for PostgreSQL

These TCP Keepalive settings help manage persistent connections in PostgreSQL, particularly in scenarios where a client might unexpectedly disconnect. They ensure timely detection and cleanup of "dead" connections to maintain system resources optimally.

tcp_keepalives_idle: After 300 seconds of inactivity, PostgreSQL will start sending keepalive probes.
tcp_keepalives_interval: If no acknowledgment of the keepalive probe is received, PostgreSQL will resend the probe every 30 seconds.
tcp_keepalives_count: If no acknowledgment is received after 10 probes, PostgreSQL will consider the connection dead and will close it.
These settings optimize resource usage and system responsiveness.

vars/main.yml

@@ -248,6 +248,9 @@ postgresql_parameters:
   - { option: "max_parallel_workers", value: "8" }
   - { option: "max_parallel_workers_per_gather", value: "2" }
   - { option: "max_parallel_maintenance_workers", value: "2" }
+  - { option: "tcp_keepalives_count", value: "10" }
+  - { option: "tcp_keepalives_idle", value: "300" }
+  - { option: "tcp_keepalives_interval", value: "30" }
 #  - { option: "old_snapshot_threshold", value: "60min" }
 #  - { option: "", value: "" }
 #  - { option: "", value: "" }