SSH Linux sensor returns free instead of available memory

Hi Paessler team

We have several linux machines which we can access only via SSH. The SSH memory sensor (we have the German version and they are called "SSH Speicherinfo") returns free memory instead of available memory. Free is an (almost) useless metric, as it also considers cached stuff in memory as being non-free. Hence free memory will sooner or later be close to zero the longer a system runs and the more the linux kernel can cache useful stuff. The free metric therefore does not provide anything useful, apart from showing whether the system was running long enough to fill the memory with useful things to cache. The really interesting metric would be available memory. But I cannot find the appropriate SSH Sensor that would show me available memory. Did I just not find it? Can you help me find the appropriate sensor?

Sidenote: I don't know what the sensor title in English is, but the German one is "Verfügbarer Speicher" that translated would mean available memory. This makes it even more confusing, that it does not return available memory (but instead returns free memory).