The last few updates have resulted in more memory use than the previous ones. My instance is tiny (on Digital Ocean), but there are only a couple of users and a handful of topics. No new topics are being created.
I had a memory monitor set to 75% of available memory. A couple updates ago, that started being exceeded regularly. I changed it to 85%, and that stopped the warnings, but the most recent update (v1.9.0.beta9 +29) is now exceeding that limit.
I’m trying b10 now.