For the past couple of weeks, I've been getting near-constant error notifications from Ubuntu (18.04 Cinnamon)
Network service discovery disabled
Your current network has a .local domain, which is not recommended and incompatible with the Avahi network service discovery. The service has been disabled.
I had never heard of Avahi in my life until these showed up. According to this AskUbuntu page, this is some sort of network software used for things like iTunes. I have never used iTunes on this computer. I haven't installed any programs that correlate to when these started to appear, as far as I can recall. The last things I can think of that I installed are the Spotify and Discord clients for Linux, both a couple of months ago, at least.
I'm prepared to disable it as outlined in the post I linked to, but I have to assume that it's there for a reason and some program is using it. Is there any way for me to know why Avahi is active on my system so that I don't break something by disabling it?