teamcity and aws have the worst error messages.
things that don't count as real error messages:
Environment health has transitioned from Degraded to Warning. Command failed on 1 out of 2 instances. Configuration update in progress on 1 instance. 0 out of 2 instances completed (running for 9 minutes). WHAT COMMAND?
No agents connected after instance start. Please check the image has TeamCity agent configured and it can connect to the server using http://foo.bar address. Start the instance manually to check for agent again. (What actually happened? Any errors? Network? Permissions? Anything? No?)
Incompatible Runner: Command Line (on a Debian instance. Fuck you.)