Currently syslog ident is hard coded in Zabbix components. It is better to have possibility to customize such idents, for example, in cases when multiple instances are running on one server.

For example:
MySQL: https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_log_syslog_tag
PostgreSQL: https://www.postgresql.org/docs/9.5/static/runtime-config-logging.html