Ok. So I found on announcements at https://community.signalusers.org/ that Signal added obtainium to the download options (due to google delays on releasing through play store). I also got another update notification from Signal app this morning, which went away once I upgraded to the latest version. Could be related ?

I had the same “that’s weird” reaction too. So not just you, would be good to know if it was kosher or a malware. I might have a dig now

I had the same at the same time. I ignored the app request and updated from app store