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I want to display a different "Submitted by" message for content that has been updated, and thus has multiple revisions.

How can I tell if I'm on the original revision, or if there are multiple revisions?

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NodeStorage::revisionIds() will let you retrieve all revisions of a node which will let you compare against the current node's version.

 // Retrieve all vids.
 $nid = 123;
 $node = Drupal\node\Entity\Node::load($nid);
 $vids = \Drupal::entityTypeManager()->getStorage('node')->revisionIds($node);

 // Does the original node's vid match the current node's vid?
 return (reset($vids) == $node->vid->getString());

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