Elixir/Phoenix Channel based chat application

Questions & Help Questions
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Hello,

I am currently investigating into writing a real time chat application in Elixir/Phoenix. I have a few queries before I jump into choosing a particular technology. Please see and answer my below queries -

  1. Is WebSocket the standard for writing real time chat applications or can I use gRPC or is there any better transport mechanism?

  2. How does Elixir/Phoenix Channel compares to other technologies or services like

    • Firestore
    • Pusher
    • Anycable
    • Action Cable

  3. If I decide to go with Elixir/Phoenix Channel, how can I run multiple instances of chat application on Kubernetes pods? Can someone points me to any document/article on this deployment part?

  4. Is there any hidden problem using WebSocket with multiple instances of chat applications that I should know about - like security/stability/scalability/performance?

Awaiting some response.

Thanks,
-Meraj