Zero has an endpoint to remove nodes - that was it I mentioned
/removeNode?id=3&group=2
https://dgraph.io/docs/deploy/dgraph-zero/#endpoints
Cuz you need to remove the unwanted node from the RAFT context. It will keep trying to connect until you remove it.
Alphas communicate with each other. So they ask Grupo Zero about who is participating in the cluster. After said they communicate directly. So Zero will not always be trying to communicate with a node. It waits for Alpha nodes to request things. Like “pull”.
If this was a leader you should first move its tablets(predicates, indexes) to another group before removing it.