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When ring is restored and next alive server node found, current node adds info about all nodes from failedNodes map to any discovery message it is about to send and sends it (see how this field is handled in ServerImpl$RingMessageWorker#sendMessageAcrossRing method).

Info
titleTcpDiscoveryAbstractMessage and its responsibilities

Any disco message can inform about failed nodes in topology (see TcpDiscoveryAbstractMessage#failedNodes collection and logic around) and all nodes receiving any disco message start processing it from updating their local failedNodes maps with info from that disco message (see ServerImpl$RingMessageWorker#processMessage where method processMessageFailedNodes is called almost at the beginning).

Also server detected failed node is responsible for creating TcpDiscoveryNodeFailedMessage - special discovery message that starts second step of removing failed node.

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