Discourseインスタンスの2022年2月15日へのアップグレードに失敗しました

You need to add some swap. Looks like you have plenty of disk, so you could add 2G or even 3G for safety.

The discourse standard setup should, I think, have already set up the swap for you. Perhaps see Create a swapfile for your Linux server

「いいね!」 3