Add your own software on RoPieee?

If I add software to the RoPieee image, will it get scrubbed when there’s an update?

I’d like to add telegraf to collect metrics into influx.

Sorry, that’s not possible.

It’s also not the purpose of RoPieee: it’s not meant as a ‘regular distro’ but as an appliance.
There are other options out there that might suite your needs better.