zabbix_server.log is being overwritten too often

[Leonidimus]

I need to catch some pretty rare problem but unfortunately Zabbix deletes zabbix_server.log when it reaches size of 1 MB and starts write it again with the same name. But with load we have it takes just 2-3 minutes so it's really hard to troubleshoot anything! Is there a way to keep at least 30 mins of logs?
[root@ops-monitor zabbix]# ls -lh zabbix_server.log
-rw-rw-r-- 1 zabbix zabbix 992K May 7 23:28 zabbix_server.log
[root@ops-monitor zabbix]# ls -lh zabbix_server.log
-rw-rw-r-- 1 zabbix zabbix 1014K May 7 23:28 zabbix_server.log
[root@ops-monitor zabbix]# ls -lh zabbix_server.log
-rw-rw-r-- 1 zabbix zabbix 5.2K May 7 23:28 zabbix_server.log
[root@ops-monitor zabbix]# ls -lh zabbix_server.log
-rw-rw-r-- 1 zabbix zabbix 45K May 7 23:29 zabbix_server.log
Thanks

[Alexei]

It is not supported in 1.1.x. ZABBIX 1.3.x (pre 1.4) already support parameter FileLogSize which defines max log file size in MB, 0 means no log rotation.