How can I collect network bandwidth on the network interface for a month?Is it possible to get data by zabbix tools? One of the main problems is to set up period for monitoring. I create calculated item that get traffic for a minute and I try to sum it by function "sum(total.traffic[{#IFNAME}],30d)", but it returns me value for the last 30 days. How can I set up some period that will return sum of values from beginning of month to nowadays?