Hello,
My site became offline. I logged in to the server and the vibe.d process was not running. I tailed the .log file and the last request was completely normal (a status monitor request). The file to where the stderr is piped was empty (I think; the run script was overriding it on startup, so I can't double check; I changed it to append now). The ulimit for the core dump was set to 0, so if it crashed no core dump was produced. I have now set the core dump limit to unlimited. I don't really know what happened... Hmm.
Luís