Github user mcgilman commented on the issue:
https://github.com/apache/nifi/pull/740
Your first impression of that message is accurate. We are only showing
actions from the node the browser is pointing to. Meaning, if that node has
other history before it was clustered it would be available. Each node is only
showing the history it knows about. If every node was only part of its current
cluster then all nodes would report the same history.
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