

I only run two instances, both run nginx and static HTML sites (plus all the stupid mandatory bits like fail2ban, python for ansible, certbot, etc. They are very low usage and get no seo or anything so they are really, really low usage.
I’ve never been warned about resources so far, and it’s been 3 years. I intensionally don’t run any high-bandwidth stuff like a matrix server or file sync for that reason.
I just lock it right down with keys and firewall entries for SSH. Logs are pretty quiet, except for llm scraping, but they are rate-limited, so they go away quickly.
Be aware that Oracle presents image “shapes” as the os images for use,which include oracle, Ubuntu, and a few others. These do have oracle metrics gathering and agents installed to help with migration between data centre zones, so it’s conceivable that they can read what’s on the os. I don’t have any PII on there except public keys and my email address.
Openwisp is an orchestration platform, but it is very overwhelming to the home/homelab user and not suitable for someone expecting the Unifi “single pane of glass”. It works best when most devices are the same model, otherwise you’re just making templates for many diferent device types.