the initial idea comes from web monitoring useragent issue ZBXNEXT-1821.
a new macro/variable {ZABBIX.VERSION} could be introduced and, among other places, supported in the user agent string in web monitoring.

other useful places :

• notifications
• map labels
• more ?

one issue could be different versions - frontend, server, proxies...
maybe long term server and proxy versions (last known) could be stored in the db, and macros/variables like {ZABBIX.VERSION.SERVER}, {ZABBIX.VERSION.FRONTEND}, {ZABBIX.VERSION.PROXY} could be used ?

similar - ZBXNEXT-2794 asks for zabbix server name macro/variable