@vatsal Specifically, the "hotswap" plugin (actually, it's built into core, but it should be a plugin) and the newrelic module both modify the application stack using the same method.
It may be possible to have the hotswap plugin work properly with newrelic, but I haven't the time to check right now 😦
@julian never mind, I have figured out that another plugin make it unable to load.
nodebb-plugin-cards
So we have 2 plugin which not compatible with new version
nodebb-plugin-cards
nodebb-plugin-cash
I will make a topic to inform this