As Linux' meminfo doesn't expose the overall memory in use, there are multiple
methods to distinguish the actually used memory.
-*Example used_memory_method*: +memavailable+ ("total memory" - "MemAvailable", matches gnome system monitor)
+*Example memory_used_method*: +memavailable+ ("total memory" - "MemAvailable", matches +free+ command)
-*Example used_memory_method*: +classical+ ("total memory" - "free" - "buffers" - "cache", matches gnome system monitor)
+*Example memory_used_method*: +classical+ ("total memory" - "free" - "buffers" - "cache", matches gnome system monitor)
*Example order*: +memory+