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I had the same thing happen. Max CPU usage, couldn't even ssh in to fix it and had to reboot from aws console. Logs don't show anything unusual apart from postgres restarting 30 minutes into the spike, possibly from being killed by the system.
You say yours solved itself in 10 minutes, mine didn't seem to stop after 2 hours, so I reeboted. It could be that my vps is just 1 CPU, 1 GB RAM, so it took longer doing whatever it was doing.
Now I set up RAM and CPU limits following this question, and an alert so I can hopefully ssh in and figure out what's happening when it's happening.
Any suggestions on what I should be looking at if I manage to get into the system?
I rebooted about 5 minutes into it. running a t2.micro instance but it went back into high cpu after reboot and I was still unable to ssh in for another 5 minutes. I just rebooted it again to be sure and it was available almost immediately.