Raspberry Pi Farm upgrade

Today i have upgraded my Raspberry Pi farm:
– Upgrade OS (bullseye) to latest version
– Created wildcard *.plaatsoft.nl HTTP certificate
– Added HaProxy software load balancer (disable Apache reverse proxy)
– Now load balancer is taking care of the HTTPS offloading
– Now load balancer route HTTP traffic to correct apache node
– Upgrade WordPress to v6.0.2 and wordpress plugins