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* Add warning if cluster fails to form fast enough Today if a leader is not discovered or elected then nodes are essentially silent at INFO and above, and log copiously at DEBUG and below. A short delay when electing a leader is not unusual, for instance if other nodes have not yet started, but a persistent failure to elect a leader is a problem worthy of log messages in the default configuration. With this change, while there is no leader each node outputs a WARN-level log message every 10 seconds (by default) indicating as such, describing the current discovery state and the current quorum(s). * Add note about whether the discovered nodes form a quorum or not * Introduce separate ClusterFormationFailureHelper ... and back out the unnecessary changes elsewhere * It can be volatile