I have three websites built with Vue/Nuxt hosted on the digital ocean with nginx reserve proxy. I check all websites every day and everything was working fine till yesterday. But today, I found a “502 bad gateway” error on one of my websites. Now, I have run built again and everything’s working fine.

But, my question is, why did this happen? Yesterday, I received a mail informing “emergency droplet migration”. Did this error occur due to CPU migration?