[Socket.io] How to using socket.io with pm2 cluster mode
### Is your feature request related to a problem? Please describe.

I'm using socket.io with pm2 cluster mode (4 instances), when the socket init on multiple nodes, it's can not merge all socket in one. I read docs https://socket.io/docs/v4/pm2/, but it's use http module. Please help me check this case. Thank you so much! 🙏 

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### Describe alternatives you've considered

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### Additional context

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