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after ran the mysqltuner.pl for percona xtaDB cluster 8.0.19 , I need to understand it

DBA100DBA100 Current User Role Patron
hi, I just built up a percona xtraDB cluster 8.0.19 and found out the existing global variable for percona xtraDB cluster 5.7. x can't on 8.0.19, I ran mysqltuner.pl to see what is the suggestion and I see this output like this and I don't know which one is the problem and what is the suggested value for it.
Question now is:
 1) it said "[--] This is a standalone server", is not true, as it is the primary node of the new 8.0.18 cluster.
 2) "Reduce your overall MySQL memory footprint for system stability" what am I supposed to do ?
 3) should I just read this section: Variables to adjust:

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