If your host is using Debian / Raspbian Buster, you should not upgrade. Due to a bug in the libseccomp2 library, it will run into a startup problem. Read more: https://github.com/louislam/uptime-kuma/issues/41#issuecomment-896164516

I read this, but it seems to be ARMv7 only, per the issue title. A little wary still, tho my docker host is x86. I guess I’ll try running a stand alone test to see if it boots.