repmgr primary unregister unregisters an inactive primary node from the repmgr metadata. This is typically when the primary has failed and is being removed from the cluster after a new primary has been promoted.
repmgr primary unregister can be run on any active repmgr node, with the ID of the node to unregister passed as --node-id.
Execute with the --dry-run option to check what would happen without actually unregistering the node.
repmgr master unregister can be used as an alias for repmgr primary unregister.