banshee/linux-collection/linux/ssh/memory

Memory of a Linux, by SSH

Returns the physical memory, the memory available as the kernel counts it, the used memory and its share. Swap is the linux/ssh/swap collector.

The collector runs cat /proc/meminfo and reads MemTotal and MemAvailable.

MemAvailable is the kernel's estimate of what can be given to a program without swapping: free memory plus the caches and buffers that can be dropped. Used memory is MemTotal − MemAvailable: caches do not count as used.
Portable: /proc/meminfo is written by the kernel the same way on Alpine, Debian and Fedora. Nothing is written on the target.
A kernel older than 3.14, without MemAvailable, stops the collector misconfigured rather than guess.

an SSH account for monitoring, without write rights;
the fingerprint of the server's host key, set in protocol:ssh:fingerprint (not needed when the Security settings trust the first SSH fingerprint presented).

Output	Unit	Meaning
`total`	MiB	physical memory
`used`	MiB	memory in use, caches excluded
`available`	MiB	memory available to programs
`used-percent`	%	share of memory in use

Watch	Kind	Defaults	Checked
`used-percent` Memory saturated	above, on `used-percent`	warning 90, critical 95, for 3 runs	yes
`available` Little memory available	below, on `available`	critical 512	no

In a container without lxcfs, /proc/meminfo shows the host's memory, not the container's limit.