Is it possible to completely ignore updates?

I have a number of HA nodes installed. A couple are in remote locations with limited mobile internet connections. The config never changes, there are no devices added: they are frozen and I’m unlikely to update them - no need to.

Unfortunately, HA still uses internet connectivity to check for updates, and the local user still sees notifications. Is there a way to tell HA and addons to not-update unless I manually ask them to?

you can write an automation to ignore updates when they come through by looking at all update entities.