We dont have a reverse proxy, requests hit cloud flare which is just doing dns resolution, which resolves to aws load balancer where the vm is defined as the target. I only see a deregistration delay of 300 seconds defined for alb.
The database is an aws RDS postgresql and for it the cpu utilization for the instance hits 50% at peak and the write iops hits 6000. When I reindexed the tables the write iops came down. will try to monitor the server performance today to verify if I need to do autovaccum and reindex regularly