https://forums.aws.amazon.com/ann.jspa?annID=8499
So obviously I was embellishing the language, but the sentiment remains the same. I found this because I checked the RDS admin panel, which I rarely do. I didn't get an email. It was very alarming to discover and makes me anxious about what other forced upgrades I'll miss.
I appreciate the point of this, but I think forcing upgrades is absolutely the wrong way to do it. Scream at me all you want, but don't force my stack to mutate and potentially break services.