diagnose an error-less server crash

I’ve had a Debian droplet for years now, running some node / Express apps, so I’m pretty familiar with the usual code-based crashes.

However I’ve noticed sometimes there is no error. The CPU usage looks totally normal like, 10%. I do have several apps running on one droplet though. (Usually zero users on) So one thought was if I ran out of server resources - that might cause a silent crash ?

How would I go about diagnosing this ? Is there another log besides the stdout log from pm2 ?

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If you’re using Nginx as proxy server, check the logs from there too.

Choked server resources can lead to your simply not responding. But if Nginx is proxying, you might be informed from the nginx logs about that happening.