During the last couple of months I've noticed that the Apocalypse Warning' TGs for some of my puppets weren't appearing (with which ones were affected apparently random). Looking more closely at Gmail today I found that the Inbox [now] has a parallel 'Promotions' folder which I hadn't noticed before... and that those "missing" TGs had ended up there rather than -- with the others -- in the main Inbox.
So, if other people here are also using Gmail to receive such TGs for their [many?] puppets and previously weren't checking the 'Promotions' folder at all, it might be a good idea to look there at least once a week just in case...