Set<ReplicaKey> nonAcknowledgingVoters() {
        Set<ReplicaKey> nonAcknowledging = new HashSet<>();
        for (ReplicaState state : voterStates.values()) {
            if (!state.hasAcknowledgedLeader) {
                nonAcknowledging.add(state.replicaKey);
            }
        }
        return nonAcknowledging;
    }
Reset the checkQuorumTimer if we've received fetch/fetchSnapshot request from the majority of the voter

@param replicaKey the replica key of the voter
@param currentTimeMs the current timestamp in millisecond
raft/src/main/java/org/apache/kafka/raft/LeaderState.java