Here it is:
$ sudo pacman -Rns pamac-tray-icon-plasma
error: target not found: pamac-tray-icon-plasma
I guess it’s Octopi notifications pop up:
Not really. I can’t remember who it was, but they were still willing to maintain it. He just couldn’t afford the hosting anymore…
I any case - octopi or pamac - test by disabling the update checker for the relevant app
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That’s a fair concern. 
I only offered an opinion because OP asked:
So, IMHO it actually became and now is relevant.
Shh, I think we just became noise.
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as pamac is more under suspection I’ve disabled check for updates option in both general and AUR sections in pamac-manager.
Ok, I’ve just got the same issue having pamac and aur “check for update” option been turned off.
Yesterday, there was an update (all packages), but without reboot, just suspend/resume events.