Hello, I would like to create a sensor that would sum up the values of printed pages of a printer. I already have a sensor working, showing the current value of printed pages. It is a custom SNMP sensor with the OID 18.104.22.168.22.214.171.124.126.96.36.199.1.
This would be used afterwards to create a map showing the growth (in printed pages) of each site of my company, combining all the printers of the site. Then, I would combine all the growth sensors of all printers to show the overall growth of the company in terms of printed pages.
To do this, I tried to create a combined sensor in order to substract the lower value of the sensor (the lower number of printed pages, which means when the sensor was created) from the current value of the sensor.
But I can't find this function, nor I can show the overall growth.
Is it the right way to proceed ? How may I find a way to show the growth of printed pages by site or the global, overall growth ?