Hello all! I have three nodes, a master and two backend nodes. On the backend nodes, it seems that mongo is not replicated since I don't see the graylog DB on either node. That makes the master node a single point of failure? If each of the three nodes should be able to assume the role of master, what's the best way to go about this? Also, when upgrading Graylog versions, should the entire cluster be stopped or can each node be upgraded while the rest of the cluster is hot?
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