Is there a place where the exit codes are documented? When I stop the server on my GCP implementation, I see several components exit with code 137. This may be perfectly normal, but it would be nice to know what the exit codes mean. Also, the window that I started the server in does not return to a command prompt when it is stopped. Is that normal? It tells me that "tmp_ui_1 exited with code 137" and that is the last message I get.

Hi @Jeff Williams - the exit codes you're seeing aren't being raised from Prefect, they're being raised from Docker. So in that case, code 137 is terminal signal as a result of the container being out of memory. You can find more information on Docker exit codes in this Medium article (and probably lots of other places)