Note Zabbix 6+ alternative in README.md

README.md

@@ -3,6 +3,9 @@
 This project provides comprehensive monitoring of PostgreSQL servers using a
 natively compiled Zabbix agent module, written in C.
 
+**N.B.** Zabbix 6+ users will probably prefer the official support for PostrgreSQL
+available in `zabbix_agent2`, [documented here](https://www.zabbix.com/documentation/6.0/en/manual/appendix/config/zabbix_agent2_plugins/postgresql_plugin).
+
 A preconfigured Zabbix Template is also included for your convenience.
 
 Sources in this project are used to compile `libzbxpgsql.so` which may be