graphql-transport-ws

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The current implementation does not support running WS servers on multiple instances and the client will not receive the message if it's subscribed on a different instance.

A solution would be to implement Redis as a fanout backend to redistribute messages on other instances.

That is correct and in order to achieve this some kind of pub/sub system is required (ideally the library should work with multiple pub/sub systems. PRs are more than welcome, though.