pg_upgrade doc: mention that replication slots must be recreated

bmomjian · bmomjian · commit a36882ef94af · 2022-07-14T16:34:30.000-04:00
Reported-by: Nikhil Shetty Discussion: https://postgr.es/m/CAFpL5Vxastip0Jei-K-=7cKXTg=5sahSe5g=om=x68NOX8+PUA@mail.gmail.com Backpatch-through: 10
diff --git a/doc/src/sgml/ref/pgupgrade.sgml b/doc/src/sgml/ref/pgupgrade.sgml
@@ -569,7 +569,8 @@ rsync --archive --delete --hard-links --size-only --no-inc-recursive /vol1/pg_tb
        Configure the servers for log shipping.  (You do not need to run
        <function>pg_start_backup()</function> and <function>pg_stop_backup()</function>
        or take a file system backup as the standbys are still synchronized
-       with the primary.)
+       with the primary.)  Replication slots are not copied and must
+       be recreated.
       </para>
      </step>
 
