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+[
+{ type: install
+ message: <<EOM
+You need to set up at least two parameters in postgresql.conf:
+
+ wal_level = logical
+ #
+ # these parameters only need to set in versions 9.4, 9.5 and 9.6
+ # default values are ok in version 10 or later
+ #
+ max_replication_slots = 10
+ max_wal_senders = 10
+
+After changing these parameters, a restart is needed.
+EOM
+}
+]